Check washing and mail theft: the comeback of an old crime

While everyone worries about high-tech scams, one of the fastest-growing financial crimes in America is stunningly analog: stealing envelopes out of mailboxes and rewriting the checks inside. Banks filed roughly 665,000 check-fraud reports in a recent year — about double the level from just a few years earlier — even as check usage keeps falling. If you still mail checks for rent, taxes, tuition, or charity, this is the scam most likely to actually reach you.

How check washing works

1. Thieves harvest mail — fishing envelopes out of the blue USPS collection boxes with glue-covered lines, breaking into apartment cluster mailboxes, or using 'arrow keys' stolen from letter carriers that open entire neighborhoods of boxes.
2. They sort for envelopes that look like they contain checks: bill payments, birthday cards, charity gifts, tax payments.
3. Using household chemicals like acetone, they 'wash' the ink off the payee line and amount — while your signature, printed in different ink or simply left alone, survives.
4. The check is rewritten to a new name and a bigger number, then deposited via mobile app into a 'mule' account, or sold. Increasingly, the physical check is also photographed and sold on Telegram channels, where buyers print counterfeit copies — so one stolen check can be cashed several times.
5. The money leaves your account when the altered check clears, often weeks after you mailed it — long after you stopped paying attention.

The good news: the law is on your side (if you're fast)

An altered or forged check is generally NOT your loss to eat — under the Uniform Commercial Code, the bank that paid it is typically responsible for making you whole, because you didn't authorize the altered payment. But your protection has a clock: you must report the fraud promptly after it appears on your statement (report within 30 days to be safe; banks can deny claims reported after long delays, and one year is a hard outer limit). Reimbursement is also frequently slow — weeks to months while banks investigate and point fingers at each other — which is miserable if the washed check was your rent money.

How to mail a check safely (if you must)

• Hand mail to a clerk inside the post office, or use your own mailbox only for INCOMING mail. Avoid blue collection boxes — especially overnight and on weekends — and never leave outgoing checks with the flag up at home.
• Write checks with a black gel pen (uni-ball 207 is the classic recommendation); gel ink bonds with paper fibers and resists washing far better than ballpoint.
• Fill lines completely and draw a line through leftover space on the payee and amount lines so nothing can be appended.
• Don't put full account numbers in the memo line; the last four digits are enough for the recipient.
• Check your account activity weekly and compare cleared check images against your records — the reporting clock starts at your statement, not at your convenience.
• Consider USPS Informed Delivery (free) so you know what mail SHOULD be arriving, and report mail theft at 1-800-ART-FRAUD or uspis.gov.

Who actually eats the loss

A common misconception keeps victims from reporting quickly: the belief that a washed check is simply their bad luck. In fact, the liability chain usually runs between banks — the bank that accepted the altered check for deposit typically bears the loss, which is why your own bank has every incentive to process your affidavit and pursue the claim. Your job is narrow but time-critical: notice the fraudulent item, report it fast, and document it in writing. Where people genuinely do lose money is at the edges — reporting months late, cashing checks for strangers ('I don't have an account, can you deposit this for me?' is always a scam that leaves YOU liable when it bounces), or ignoring the follow-on counterfeits that appear after the account number circulates.

If one of your checks is stolen or altered

1. Call your bank immediately, file an affidavit of forgery/alteration, and ask whether to close the account entirely — with mobile-deposit counterfeiting, a compromised account number keeps paying thieves, so closing and reopening is usually the right call.
2. Put stop-payments on any other checks still outstanding from that account.
3. Notify whoever was supposed to receive the original payment (landlord, IRS, charity) before you rack up late fees, and re-pay them electronically.
4. Report to the US Postal Inspection Service (uspis.gov) and file at reportfraud.ftc.gov; if your identity documents were also in the mail, add an identity-theft report at identitytheft.gov and freeze your credit.
5. Watch the account for months — stolen checks are resold, and a second wave of counterfeits is common.

The bottom line

Check fraud is booming precisely because checks are a 1950s technology carrying 2020s money. Your defenses, in order: write fewer checks, mail the unavoidable ones from inside a post office in gel ink, watch your account weekly, and report anything suspicious the day you see it. The law will usually get your money back — but the version of you that switched to online bill pay never has to find out how long that takes.