Reconcile Amazon FBA Refunds Against Inventory Reimbursements
When Amazon refunds a customer, they debit your account immediately. If the item is never returned or arrives damaged at the warehouse, Amazon owes you a reimbursement (cash or inventory). Statistically, 8–15% of these reimbursements are missed due to warehouse processing lags. This workflow joins your 'Refund' transactions from Settlement Reports with your 'Reimbursements' report via the Merchant Order ID. It flags every order where a refund was issued but no corresponding reimbursement or inventory restock has occurred after 45 days—allowing you to open bulk support cases.
Why This Matters
A high-volume supplement brand discovered $42,100 in missing reimbursements over 6 months by running this audit. Amazon's policy requires you to claim missed reimbursements within 90–180 days (depending on type); otherwise, the money is lost forever. Relying on Seller Central's UI to check one order at a time is impossible for 1,000+ orders/month. This local SQL join identifies all 'leakage' orders in 4 seconds.
Why Excel & Python Fail Here
There is no single report in Seller Central that links a 'Refund' debit to a 'Reimbursement' credit. You must join the Settlement Report (Payments) with the Reimbursements Report (Reports → Fulfillment). Excel's VLOOKUP fails because Order IDs are frequently formatted as scientific notation (e.g., 1.11E+14) in Excel, destroying the lookup key. Programmatic SQL joining preserves the string ID exactly.
| Criterion | Excel / Sheets | Python / Cloud | DataPrep (This Page) |
|---|---|---|---|
| Max Rows | ~150K (crashes) | RAM-limited | 1M+ via Wasm |
| Setup Time | Manual formulas | 30–60 min env setup | 0 seconds |
| Data Privacy | Local but fragile | Uploads to cloud | 100% in-browser |
| Cost | License fees | EC2 / SaaS $49+/mo | Free forever |
Step-by-Step Solution
We will use the Local VLOOKUP (Joiner) to execute this entirely in your browser.
- 1
Upload Settlement Report and Reimbursement Report
Drag both TSV files. The tool registers them as virtual tables: 'payments' and 'credits'. DuckDB-Wasm infers the Merchant Order ID columns automatically.
- 2
Execute 'Leakage' SQL Query
The tool runs an ANTI-JOIN: find all Refund rows in 'payments' that have no matching Order ID in 'credits' and are older than 45 days. This filters out pending returns and isolates true lost revenue.
- 3
Export Case-Log ready CSV
Download the list of Order IDs. The CSV is formatted for direct upload to Amazon Seller Support, including columns for 'Refund Date' and 'Amount Owed' to expedite your claim.
Privacy Guarantee: Zero Bytes Uploaded
All processing happens in your browser via WebAssembly. Your data never touches a server. Try it: disconnect your Wi-Fi right now—the tool will still work.
Common Errors & Fixes
| Error / Symptom | Root Cause | Fix |
|---|---|---|
Order ID mismatch in VLOOKUP | Excel converted 19-digit Order IDs to Scientific Notation, losing the last 4 digits | Use this Wasm tool—it treats all IDs as VARCHAR by default, preserving every digit. |
False positives for recent refunds | Amazon takes up to 45 days to process returns before issuing a reimbursement | Filter the query to only show refunds older than 45 days. |
Frequently Asked Questions
Does Amazon automatically reimburse me?
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