If you sent it
Not delivered yet with a bad address on the label: USPS Package Intercept can turn the box around or park it at a Post Office, for a $19.45 fee charged only if the grab works, per usps.com, checked 2026-07-27. It has to happen before the package goes out for delivery, and USPS is candid that an intercept can fail. Already dropped at the wrong door: open a case with the carrier that ran the route and keep the buyer in the loop while it runs. Mail that cannot be delivered as addressed generally travels home via the return address, and a piece without one ends up at the local Post Office or the Mail Recovery Center.
If you were expecting it
Start on the tracking page. UPS points recipients to Tracking Details to see where a driver left a box, and FedEx offers picture proof of delivery right on its tracking screen, both checked at their sites on 2026-07-27. Ask the household and the two nearest neighbors before escalating. Still empty-handed: FedEx's tracking page has a Manage Delivery, Report Missing Package flow that issues a case number, UPS lets a recipient file as a guest at ups.com, and the seller should hear about it the same day so a trace can start from the shipper side too.
If a stranger's box landed on your porch
For USPS items, write Not at this address on the piece without covering the printed address, then drop it back in the mailbox or hand it to your carrier, per faq.usps.com, checked 2026-07-27. USPS also warns that willfully destroying someone else's mail can be a federal offense, so the trash can is not an option. A UPS or FedEx box that is not yours goes back through that carrier's support channels; both list contact paths on their sites.