If you have ever built or maintained an order-tracking feature, you have seen this ticket: the customer has a real tracking number, your lookup returns nothing, and everyone assumes the parcel is lost. Usually it is not. Two documented carrier behaviours cause most of it, and both have consequences for your schema.

Disclosure: I work on 24hTrack. Written with AI assistance.

1. Corporate ownership is not a tracking namespace

FedEx acquired TNT in 2016, and tnt.com today carries FedEx's own property notice plus the line "TNT will become FedEx". It is natural to conclude that a TNT number is now a FedEx number. It is not. TNT's own FAQ still states:

FedEx shipments can be tracked at fedex.com, and TNT consignment tracking is available at tnt.com.

One group, two tracking systems.…