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.
Bottom Line. Banks can cash a check at any time so long as they do not have reason to look at the date and see if it is six months old, but you should still cash your payroll checks immediately. Companies usually include an expiration date on their payments, so they do not have too many withdrawals at once.n general, all checks become stale after six months. However, state law may require that banks honor any payroll claim, even if the date on the restrictive legend has passed. In addition, banks typically do not look at the date on a check, so it will likely get cashed.