1. The merchant has not delivered the goods, and the express information has not been entered.
2. The logistics information is not updated in time, and the merchants or courier companies have not entered new logistics information in time.
3. The courier company has not fully covered or opened this service, resulting in the failure to find the single number on SF Express.
4. The single number entered is wrong or incorrect.
5. Logistics information lags behind. Because there may be many factors that affect the recording, updating and pushing of logistics information during transportation, the information is delayed or delayed, and the corresponding information cannot be found.
6. The loss of logistics information may be due to the abnormality in the express delivery process or the loss of logistics information records, which leads to the inability to find the logistics information corresponding to the waybill.