Once you reserve a PO Box at the Post Office location, link it to your USPS.com account. You can manage it online instead of the Post Office location. Link a PO Box to an USPS.com Account
Quick Answer. Cashier's checks themselves do not expire as personal checks do. However, the funds behind the check are subject to state escheat laws.
When Do Personal Checks Expire? Personal checks older than six months are sometimes called âstale-datedâ checks. The UCC states that banks/credit unions have no obligation to deposit or cash a check older than six months. But this isnât so much a rule as it is a guideline.