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.
Itâs not usually accurate to say that checks expire since they are financial instruments that donât have a strict end date. Most banks and banking executives agree that checks will become stale after a certain point, usually six months, but this isnât usually quite the same as an expiration.