The tracking says that my package has arrived, but it hasn't - help!
USPS Tracking is mostly reliable, but can be erratic. 99% of the time, the package arrives safe and sound. Please wait a day or two. If you need immediate help, contact your local Post Office, ask for the Postmaster and provide your tracking. They will have more localized information and can help pinpoint the status of your package from their end.
Read next: If I order today, when will I receive it?