The tracking number may come from the USPS, UPS, or another carrier; how scammers access the numbers is unclear, but that's a problem for the carriers to address.

Using a tracking number is a common way to find a package in transit. The USPS automatically generates tracking numbers for most non-commercial domestic parcel services except First-Class Mail ...

The Distribution Center has now implemented its own tracking system that covers the gap. Employees receiving packages on campus can now visit the Distribution Center’s package tracking webpage and ...

USPS warns about 'smishing' text messages: What to know Customers must request package tracking text messages from the United States Postal Service.

The tracking number may come from the USPS, UPS, or another carrier; how scammers access the numbers is unclear, but that's a problem for the carriers to address.