usps money order verification number
U.S. Postal Service Money Order Verification System at 866-459-7822; The safest option is cash: The best way to make sure you donât get ripped off is to cash a money order directly with the issuer. 1  To do this, take it to the issuer and not your bank. 2  If a money order is for more than $1,000 (or $700 for an international USPS money order), youâve probably got a fake.