SF Express number,
But it can't be found on the online logistics information; You can only see it on the courier.
Because this involves the security control of customer information by express delivery companies, SF will not provide information generally without justifiable reasons or proof. You can call the hotline first. However, the only way for most inquiries is the express delivery number, which can only query the package information, but can't view the information of the recipient and the sender.
Tip: If you receive the parcel, please destroy the express and throw it away, otherwise there is a danger of information leakage.