In the United States, only the USPS is authorized to ship packages to PO Box or APO/FPO addresses. On the other hand, UPS, FedEx, DHL, and TNT cannot deliver packages to such addresses. Usually, we don't ask our factory to arrange shipment through a specific courier because delivery fees vary depending on the destination, and the courier's decision is based on their own considerations. It is generally not recommended to use P.O. Box addresses because they are susceptible to delivery failure or delay. Please note that when providing your address, use your exact address information and avoid using P.O. Box addresses.