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.
Even expiration dates written on checks, such as void after 90 days, can be overlooked at the bank's discretion. There is no UCC provision that specifically addresses validity of check expiration dates, says Mike Townsend, spokesman for the American Bankers Association. consumer who comes across one of these uncashed checks faces a conundrum. While it may be possible to cash a check that's more than 6 months to a year old, there are several things consumers need to consider before heading to the bank with Nana's old checks.