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.
Travelerâs Checks. Travelerâs checks work like cash and are backed by guaranteed funds. Because of this, they donât expire. How to Avoid the Problem of Expired Checks. In all cases, the best practice is to deposit or cash checks promptly or at least before six months have passed.