How will I know when APO Box Receives my package? January 26, 2023 15:46 Updated APO Box will send you an e-mail providing you a package number along with a status for the order. Related articles What are the mailing restrictions for APO/FPO Addresses? My credit card was declined? What do I need to do? What if my package needs signature upon delivery? What happens to my package if it exceeds the physical restrictions? Is military mail subject to host country customs requirements?