I used to work at Amazon, so I have some insight as to how this works... here is a common scenario:
- Package goes through UPS label printer/stamper. The UPS track # is assigned, but does not ping UPS computer system at all.
- Package is stacked up on the shipping dock in a pallet (for high volume operations obviously)
- Shipper sends electronic manifest to UPS
- UPS picks up pallet
The last two happen in either order, and you don't always get origin scans on pallet fulls. The UPS freight driver is not going to break down a pallet and scan all items. In theory the pallet has it's own id, which is mapped to all the package IDs (via the electronic manifest). So a single pallet scan should trigger entries for all items, but this doesn't happen all the time.
Sometimes the first scan is when the pallet is broken down at the UPS hub and sent out. So you can go from 'electronic billing received' to 'scanned at UPS hub' with no origin scan.
The origin scan is most reliable for 1-off shipments from small businesses.
Another possibility is that Tmobile messed up a bit, and sent manifests like a week before they actually load them into the UPS system.