Why can't SF Express find the waybill number?

Either 1. The seller has updated the delivery information, which can only prove that his courier list is ready to be sent, rather than being displayed after the courier is taken away. 2. Express outlets have not been updated, but this is unlikely to happen in SF, because their express delivery will be updated at any time, and there is a small thing similar to a mobile phone in their hand, which is great. SF will also send you a text message saying that your express mail has been delivered.