Embodiments relate to systems, devices, and computer-implemented methods for tracking delivery items associated with a postal tracking product that includes a tracking bar code and a serial number. The tracking bar code can be attached to a delivery item and mailed. The delivery item can be processed by a delivery processing system, which can capture an image of the delivery item and the tracking bar code, and can extract a tracking number from the tracking bar code. The delivery processing system can report information on the location of the delivery item using the tracking number, and an indication of the location can be provided to a user that enters the serial number into a tracking interface.