He said the closest UPS store.
You must make every effort to obtain a street address. If a shipper should use a P.O. Box address, the recipient´s telephone number must be included on the label. Your package that is addressed to a P.O. Box may be delayed, will not be covered by any UPS Service Guarantee, and will require an address correction charge. Army Post Office (APO) and Fleet Post Office (FPO) addresses are not accepted.
Not accepted is different from "closest UPS location" but I'm assuming you don't know what APO/FPO addresses represent.