What is check washing?

Mail theft-related check fraud: thieves steal mail, chemically “wash” the ink, and rewrite the payee and amount. FinCEN tracked the surge — 350,000 SARs in 2021, up 23%, to more than 680,000 in 2022 — with altered, counterfeit, and fraudulently signed checks totaling more than $688 million in the six months after its 2023 alert.

Scam verdict · Educational pattern check

Scam Detective research desk · Updated October 2026

Real fraud — act fast

Did a Check You Mailed Get Cashed by a Stranger? That's Check Washing — and the Clock Matters

Q: What should I do if a check I mailed was cashed by a stranger?

Tell your bank first — immediately; the forgery-claim window is short — then report the mail theft to the U.S. Postal Inspection Service at 1-877-876-2455 or uspis.gov/report. The longer a washed check sits, the harder the clawback.

Q: How do I prevent check washing?

Write checks in gel ink that resists solvents, drop them inside the post office rather than a street box, pick up your mail promptly, and reconcile your account weekly. The defense costs almost nothing — and it works because it starves the supply line.

It's called check washing, and FinCEN has tracked a nationwide surge: mail theft-related check fraud SARs climbed from 350,000 in 2021 — up 23% over the prior year — to more than 680,000 in 2022. Thieves steal mail, chemically “wash” your check, and rewrite the payee and amount — in the six months after FinCEN's February 2023 alert, 15,417 related reports from 841 institutions totaling more than $688 million, filed from every state, D.C., and Puerto Rico: 44% were altered and deposited, 26% outright counterfeit, 20% fraudulently signed, and banks filed 88% of them. Tell your bank first — the forgery-claim window is short — then report the mail theft to the U.S. Postal Inspection Service at 1-877-876-2455 or uspis.gov/report. Write checks in gel ink, drop them inside the post office, pick up mail promptly, and reconcile weekly.

Educational verdict from documented scam patterns — not a live report. For a 0–100 risk score on the exact link in your hand, run the checker.

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Straight from the source

The verdict stands on the public record — the line below is quoted verbatim from the source named under it.

“The FTA demonstrates the severity of mail theft-related check fraud and why fraud is a high priority… Suspicious Activity Reports are a valuable tool utilized by Postal Inspectors for not only targeting criminal networks and their illegally derived assets, but they also aid in the identification of victims.”

— Chief Postal Inspector Gary R. Barksdale, U.S. Postal Inspection Service, Sept. 9, 2024.

Why this question never goes away

A paper check feels old-fashioned; the fraud figures say it's a growth market. FinCEN's February 2023 alert, issued under Director Himamauli Das, tracked mail theft-related check fraud SARs climbing from 350,000 in 2021 — up 23% over the prior year — to more than 680,000 in 2022. The September 2024 depth analysis under Director Andrea Gacki put shape to it: in the six months after the alert, 15,417 related reports from 841 institutions totaling more than $688 million, filed from every state, D.C., and Puerto Rico — 44% of the checks were altered and deposited, 26% were outright counterfeit, 20% were fraudulently signed — and banks filed 88% of the reports. The mechanics are primitive: mail pulled from collection boxes or cluster mailboxes, the ink dissolved, the check rewritten to a new payee — sometimes for a new amount. The clock matters because your bank's forgery-claim window is short, and the longer a washed check sits, the harder the clawback. The defense costs almost nothing: gel ink that resists solvents, drop checks inside the post office rather than a street box, pick up your mail promptly, and reconcile your account weekly.

Five red flags — any one is enough

A check you mailed was cashed — but the payee or amount doesn't match what you wrote. That's washing, not a bank error: 44% of the post-alert reports were checks altered and deposited.

Mail theft in your area — collection-box and cluster-box raids are the supply line; the wave reached every state, D.C., and Puerto Rico.

A “bank” call or text about your cashed check asking you to “verify” account details — the follow-on phish rides the same fraud wave; your real bank doesn't need your account number to see the check.

A payment that never arrived — rent, a bill, a gift — cashed by a stranger weeks later. The delay is the tell: the longer it sits, the harder the clawback.

Check images on your statement that don't match your handwriting or the check you remember writing — 26% of the reports were outright counterfeits and 20% fraudulently signed.

Your next three moves

Tell your bank first — immediately. The forgery-claim window is short: report the altered or counterfeit check, sign the affidavit, and ask about a claim on the item. The longer a washed check sits, the harder the clawback.

Report the mail theft to the U.S. Postal Inspection Service at 1-877-876-2455 or uspis.gov/report — and freeze the checkbook: stop sending paper checks until you've reviewed every outstanding item.

Change the habits that feed it — gel ink that resists solvents, drop checks inside the post office rather than a street box, pick up mail promptly, reconcile weekly — and report the fraud at reportfraud.ftc.gov; run any “bank” link from a message through the $2 instant check first.

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