A valid tracking number that returns nothing: two carrier facts that break order lookups

<p>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.</p> <p><em>Disclosure: I work on 24hTrack. Written with AI assistance.</em></p>

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