This application discloses a method and system for facilitating the delivery of a mail piece bearing a post office box identifier to a United States Postal Service Branch, for final delivery to a post office box. The system facilitates the delivery by scanning the mail piece and obtaining the mail piece's destination information. If the destination information includes a post office box identifier, e.g., P.O. Box #1234, the system determines a street address of the post office location containing P.O. Box #1234. The street address is determined using the zip code contained within the destination information. Once the street address is determined, a new label, bearing the street address of the USPS branch location is affixed to the mail piece so that the mail piece can be delivered to the consignee.