Amazon FBA Reimbursement Guide: How to Recover Money Amazon Owes You

Amazon Loses Your Inventory — And It Happens More Often Than You Think

Amazon's fulfillment network processes billions of items per year across hundreds of warehouses. At that scale, mistakes are inevitable. Inventory gets lost in transit between fulfillment centers. Products get damaged by warehouse equipment. Customers return items that never make it back to sellable inventory. Fees get miscalculated.

Amazon does have automated systems that detect and reimburse some of these errors. But the automated systems miss a significant number of cases. Industry estimates suggest that Amazon's automatic reimbursement processes catch 30-60% of eligible cases, leaving the remainder for sellers to identify and claim themselves.

For a seller doing $500,000 in annual revenue, unclaimed reimbursements typically range from $5,000 to $15,000 per year — money that is rightfully yours but requires effort to recover. This guide covers every type of reimbursable event, how to identify them in your reports, and the exact process for filing claims.

Type 1: Lost Inventory

Lost inventory is the most common reimbursement category. It occurs when Amazon cannot account for units that should be in their fulfillment centers.

How inventory gets lost:

• Misplaced during inbound receiving (units scanned in but placed in wrong location)
• Lost during transfers between fulfillment centers
• Miscounted during cycle counts (Amazon's internal inventory audits)
• Missing from inbound shipments (Amazon claims they received fewer units than you shipped)

How to identify lost inventory:

Method 1: Inventory Adjustments Report

In Seller Central, go to Reports > Fulfillment > Inventory Adjustments. This report shows every inventory adjustment Amazon makes, with reason codes:

Key reason codes for potential reimbursements:

• M (Misplaced and Found): Amazon lost the unit and later found it. If found, no reimbursement needed. If not found after 30 days, you are owed a reimbursement.
• D (Damaged at Warehouse): Amazon damaged the unit. Check if reimbursement was issued.
• E (Expired): Amazon removed expired inventory. May or may not be reimbursable depending on your agreement.

Method 2: Inventory Ledger Report

The Inventory Ledger (Reports > Fulfillment > Inventory Ledger) gives you a running balance of every unit by event type. Look for unexplained decreases not matched by sales or customer returns.

Method 3: Compare Shipment Records to Received Quantities

Go to your Shipping Queue and compare "Units Shipped" to "Units Received" for each inbound shipment. Discrepancies over 30 days old (giving Amazon time to fully receive the shipment) are candidates for claims.

Example: You shipped 500 units in Shipment FBA15ABC123. Amazon's receiving report shows 487 units received. After 30 days, the remaining 13 units were never accounted for. You are owed reimbursement for 13 units.

Type 2: Warehouse-Damaged Inventory

When Amazon's warehouse operations damage your inventory — whether through forklift accidents, water damage, improper storage, or handling errors — you are entitled to reimbursement.

How to identify damaged inventory:

The Inventory Adjustments Report shows damage events with reason code "D" (Damaged at Warehouse) or "W" (Damaged by Warehouse). Amazon should automatically reimburse these, but verify in the Reimbursements Report.

Checking for missed reimbursements:

1. Download the Inventory Adjustments Report for the last 18 months
2. Filter for disposition "WAREHOUSE_DAMAGE" or reason "DAMAGED_AT_WAREHOUSE"
3. Note the quantity and date for each event
4. Cross-reference with the Reimbursements Report (Reports > Fulfillment > Reimbursements)
5. If a damage event does not have a corresponding reimbursement within 30 days, file a claim

Important distinction: Amazon only reimburses for inventory damaged by their operations. If your product was damaged during inbound shipping (before Amazon received it), that is not reimbursable by Amazon — it is a claim for your carrier insurance.

Type 3: Customer Returns Not Actually Returned

This is one of the most profitable reimbursement categories for sellers. When a customer initiates a return, Amazon refunds them immediately. The customer then has 45 days to ship the item back. If they never return it, Amazon should either charge the customer or reimburse you. But this process does not always work correctly.

How to identify unreturned customer returns:

1. Download the Customer Returns Report (Reports > Fulfillment > Customer Returns)
2. Download the Reimbursements Report for the same period
3. Identify returns where:

- A refund was issued to the customer (you lost the sale revenue)

- More than 45 days have passed since the refund

- The item status does not show "Unit returned to inventory" or "Reimbursed"

- No corresponding reimbursement appears in the Reimbursements Report

Example: Customer ordered your $29.99 product on January 15. Return initiated January 25. Refund issued to customer January 25. As of March 15 (49 days later), no return received at warehouse, no reimbursement issued to you. This is a valid claim.

Scale of the problem: Depending on your category and return rate, 5-15% of customer returns may never be physically returned. If your return rate is 4% on 1,000 monthly units and 10% of those returns are never received, that is 4 units per month at $30 each — $120/month or $1,440/year in missed reimbursements from this category alone.

Type 4: Overcharged FBA Fees

Amazon calculates FBA fulfillment fees based on your product's dimensions and weight. If Amazon measures your product incorrectly (which happens surprisingly often), you could be paying the wrong size tier fee on every single unit sold.

How overcharges happen:

• Amazon's automated cubiscan machines occasionally mismeasure products
• Measurements taken with packaging that is slightly different from the standard packaging
• Products reclassified to the wrong size tier after a remeasurement
• Weight rounded up to the next tier incorrectly

How to identify fee overcharges:

1. Go to Reports > Fulfillment > Fee Preview
2. Download the report and check the dimensions and size tier for each ASIN
3. Compare Amazon's recorded dimensions against your actual product dimensions
4. If Amazon's measurements are larger than reality, you are being overcharged

What to check:

• Length, width, height (compare to your actual packaging dimensions)
• Weight (compare to your actual shipping weight)
• Size tier classification (verify it matches the actual dimensions)

Example: Your product's actual packaging is 11 x 7 x 3 inches and weighs 13 oz. Amazon has it recorded as 12 x 8 x 3.5 inches and 1.1 lb. The correct size tier is Large Standard 12-16 oz ($4.33), but Amazon is charging you the Large Standard 1-1.5 lb rate ($4.85). That is $0.52 overcharge per unit.

At 500 units per month, this is $260/month or $3,120/year in overcharges.

How to fix it:

1. Open a case in Seller Central requesting a remeasurement (called a "cubiscan request")
2. Provide your actual product dimensions and weight with photographic evidence if possible
3. Amazon will remeasure and update if they confirm the error
4. Request retroactive reimbursement for the overcharges (Amazon does not always offer this proactively, but they should honor it if you request it)

Type 5: Removal Order Discrepancies

When you create a removal order, Amazon ships your inventory back to you. But sometimes the quantity received does not match the quantity Amazon said they shipped.

How to identify:

1. Track all removal orders in a spreadsheet
2. When the shipment arrives, count the actual units received
3. Compare to the removal order quantity
4. If there is a discrepancy and Amazon shows the removal as complete, file a claim

How to File Reimbursement Claims

Step 1: Gather documentation

Before opening a case, compile:

• The specific transaction IDs, dates, and quantities involved
• The relevant report data (Inventory Adjustments, Returns, Fee Preview)
• Your own records (inbound shipping receipts, product specs)
• Clear explanation of the discrepancy

Step 2: Open a case in Seller Central

Go to Help > Get Help > Selling on Amazon > Fulfillment by Amazon > FBA Issue

Select the appropriate category:

• "Investigate missing inventory in FBA" for lost inventory
• "Request FBA inventory reimbursement" for warehouse damage or unreturned returns
• "Product Fees and Dimensions" for fee overcharges

Step 3: Provide clear, specific information

Amazon's support team handles thousands of cases daily. Make it easy for them:

• State the issue clearly in the first sentence
• Include specific shipment IDs, transaction IDs, or order IDs
• Reference the exact dates and quantities
• State what reimbursement amount you expect and why
• Attach relevant report screenshots or exports

Example case message for lost inventory:

"I shipped 500 units of ASIN B0XXXXXXXXX in shipment FBA15ABC123 on January 10, 2026. Amazon's receiving report shows 487 units received as of January 25. It has been over 45 days and the remaining 13 units have not been reconciled. I am requesting reimbursement for 13 units of [Product Name] at the current selling price of $24.99 per unit."

Step 4: Follow up if needed

Amazon may ask for additional information or initially deny the claim. If denied:

• Review the denial reason carefully
• Provide additional documentation if requested
• Escalate if you believe the denial is incorrect (you can request manager review)
• Keep all case correspondence for your records

Time Limits for Filing Claims

Amazon has strict time limits for reimbursement claims. Missing these deadlines forfeits your right to reimbursement:

• Inbound shipment discrepancies: Must be filed within 9 months of the shipment being received
• Lost or damaged inventory in fulfillment center: Must be filed within 18 months of the event
• Customer return issues: Must be filed between 45 and 105 days after the customer refund (before 45 days, the customer still has time to return; after 105 days, Amazon considers the claim expired)
• Removal order discrepancies: Must be filed within 18 months

Recommendation: Run your reimbursement audit monthly. Waiting too long means cases expire.

Building a Monthly Reimbursement Audit Process

Create a repeatable monthly process:

Week 1: Inbound shipment reconciliation (30 minutes)

• Review all shipments closed in the past 30-60 days
• Compare shipped vs. received quantities
• File claims for discrepancies over 30 days old

Week 2: Customer returns audit (45 minutes)

• Download customer returns from 45-90 days ago
• Cross-reference with reimbursements
• Identify unreturned units with no reimbursement
• File claims for units not returned after 45+ days

Week 3: Inventory adjustment review (30 minutes)

• Check inventory adjustments for lost or damaged units
• Verify reimbursements were issued for warehouse-damaged inventory
• File claims for any unresolved adjustments over 30 days old

Week 4: Fee audit (30 minutes, quarterly is sufficient)

• Download fee preview for top 20 SKUs by sales volume
• Compare Amazon's dimensions to actual product dimensions
• Request remeasurement for any discrepancies
• File for retroactive refund if overcharges are confirmed

SellerPilot AI helps with this process by reconciling your financial data from Amazon's SP-API, flagging transactions where expected reimbursements are missing, and tracking the aging of potential claims so you do not miss filing deadlines.

What Amazon Reimburses and How Much

When Amazon approves a reimbursement, they typically pay based on the item's estimated value, which they calculate using:

• Your recent selling price for the ASIN
• Comparable product prices
• Manufacturing cost (if you have provided it)

Important: Amazon's estimated value may be lower than your actual selling price. If the reimbursement amount seems incorrect:

• Open a new case referencing the original reimbursement
• Provide your sales history showing the correct selling price
• Request adjustment to the fair market value

Reimbursement methods:

• Cash reimbursement to your seller account balance (most common)
• Inventory replacement (Amazon returns the original or equivalent unit to your inventory)

Common Mistakes in the Reimbursement Process

Mistake 1: Relying on Amazon's automatic reimbursements

Amazon's systems catch many cases automatically, but they miss a significant percentage. Always audit.

Mistake 2: Filing claims too early

For customer returns, filing before the 45-day return window closes will result in denial. For inbound shipments, filing before Amazon has had time to fully receive and reconcile (allow 30 days) wastes your time.

Mistake 3: Filing vague or incomplete cases

"Amazon lost my inventory" is not a useful case. Include specific IDs, dates, quantities, and the report data supporting your claim.

Mistake 4: Not tracking case outcomes

Keep a spreadsheet of all cases filed, amounts claimed, and outcomes. This helps you identify patterns (certain fulfillment centers may be more error-prone) and ensures nothing falls through the cracks.

Mistake 5: Giving up after a denial

First-round denials are common and do not always mean the claim is invalid. Provide additional documentation and escalate if needed.

Key Takeaways

1. Amazon's fulfillment errors cost sellers 1-3% of revenue. Most of this is recoverable through reimbursement claims.
2. The five main reimbursement categories: lost inventory, warehouse damage, unreturned customer returns, overcharged fees, and removal order discrepancies.
3. Amazon's automatic reimbursement systems miss an estimated 30-50% of eligible cases. Manual auditing is essential.
4. File claims within the time limits: 9 months for inbound shipments, 18 months for warehouse events, 45-105 days for return issues.
5. Provide specific transaction IDs, dates, and quantities in every claim. Clear cases get resolved faster.
6. Run a monthly reimbursement audit covering inbound shipments, returns, and inventory adjustments.
7. Check your product dimensions in the Fee Preview report quarterly — incorrect measurements can cost thousands per year.
8. Keep records of all claims filed and their outcomes for pattern analysis and follow-up.

FBA reimbursements are not a windfall — they are money that is already rightfully yours. Amazon's terms of service entitle you to reimbursement when their fulfillment operations cause inventory loss or damage. The only question is whether you invest the time to identify and claim what you are owed.