post office box tracking refers to tracking items sent to or from a PO Box using USPS tracking tools. When sending a package to a PO Box, the recipient is notified via a USPS tracking number once the item is available for pickup. You can track this online or via the USPS app. Packages held in PO Boxes are typically secure and accessible 24/7, depending on the location. This method is popular among individuals and small businesses that require privacy or consistent mailing addresses without the need for home delivery.