Guide
How to Audit Your Amazon FBA Reports for Missing Money
Every dollar Amazon owes you is already documented — by Amazon, in reports you can download today. The money goes unclaimed because reconciling those reports is dull, not because it's hard. This is a concrete walkthrough of the audit: which four reports to pull, what to match against what, and how to turn the unmatched rows into filed claims. Budget an hour the first time; half that once you have the rhythm.
Pull the four reports that matter
Everything lives in Seller Central under Reports → Fulfillment. You need: the Inventory Adjustments report (every lost, damaged, and found event, with reason codes), the Reimbursements report (every credit Amazon actually paid), the FBA Customer Returns report (every refunded order and whether the item came back), and your inbound shipment details (units shipped versus received per shipment). Export each for the same date range. Because claim windows are short now, the useful range is roughly the last 60-90 days — older discrepancies are likely expired, and chasing them wastes the energy you need for the live ones.
Reconcile losses and damages against reimbursements
This is the core of the audit. In the Inventory Adjustments report, filter to lost and damaged reason codes, and net out any 'found' corrections — Amazon often relocates a lost unit days later, and a loss that was found isn't a claim. What remains is a list of units Amazon destroyed or misplaced. Now match each against the Reimbursements report by FNSKU and approximate date. Every loss or damage event with no matching credit after a couple of weeks is a claim candidate. In a spreadsheet this is a pivot by FNSKU on each report and a subtraction; the number that falls out is units owed.
Check refunded returns that never came back
The returns leak is the one sellers most often miss entirely. When a customer gets a refund, the clock starts: they're expected to send the item back, and if it never re-enters your inventory within the return window, Amazon's policy provides for reimbursing you. In the FBA Customer Returns report, take refunds older than 60 days and check each order for a corresponding return event putting the unit back in stock — sellable or unsellable. Refund, no return, no reimbursement: claim candidate. On stores with meaningful return volume this single check often finds more money than lost inventory does.
Reconcile inbound shipments and spot-check your fees
Two smaller passes round out the audit. Inbound: for each recently closed shipment, compare units shipped to units located per SKU; short receipts past the reconciliation stage are claimable, and having your supplier invoice ready pre-empts Amazon's usual evidence request. Fees: for your top SKUs by volume, compare the dimensions and weight Amazon has on file against a tape measure and a kitchen scale. A product bumped into the wrong size tier overpays on every single unit — fixing one measurement error can be worth more annually than all your lost-unit claims combined, and correcting it stops the bleed going forward.
Turn the discrepancy list into filed claims
For each unmatched row, open a case via Seller Central → Help → Get Support under the FBA issue path. One case per issue. State the identifiers (SKU/FNSKU, shipment ID if inbound), the quantity, the event date or reason code, and the request in a sentence or two — agents approve claims they can verify in under a minute. Log every case ID, filing date, and outcome in a tracking sheet; a denied case with solid evidence deserves exactly one firm, polite follow-up restating the numbers. Then diarize the next audit, because the reports refill with discrepancies continuously and the claim windows won't wait for you.
Or make the audit a button instead of a chore
Everything above is deterministic report-matching — which makes it perfect software work. RefundFox runs this exact audit automatically: ingest your FBA reports, net every adjustment, return, and shipment against every reimbursement, and produce a claim list with paste-ready case text including the SKU, quantity, and fulfillment center. Flat monthly fee; the recovered money is 100% yours, not 75%. It's in early access — join the waitlist on the homepage and we'll invite you as slots open, so your next audit takes minutes instead of an afternoon.
Stop leaving FBA money on the table
RefundFox scans your own Amazon reports, flags every unreimbursed unit, and writes the claim text — for a flat monthly fee, not a 25% cut. We're in early access.
Join the waitlist →Frequently asked
Which Amazon reports show money I'm owed?
Four under Reports → Fulfillment: Inventory Adjustments (losses and damages), Reimbursements (what Amazon paid), FBA Customer Returns (refunds without returns), and inbound shipment details (short receipts). The claims are the events with no matching credit.
How often should I audit my FBA account?
Monthly at minimum. Amazon's claim windows are now short enough that quarterly or annual audits let valid claims expire before you ever see them. A recurring 30-minute pass over the last 60-90 days keeps everything inside the window.
Can I automate an FBA reimbursement audit?
Yes — the audit is deterministic report reconciliation, which software does well. RefundFox scans your own reports, flags every unreimbursed discrepancy, and writes the claim text, for a flat fee instead of a percentage of your recovery.