1. Ask the recipient: You can contact the recipient and ask if someone sent you a courier.
2. Check the logistics information: If you have received the courier, you can check the logistics information to see if there is any information about the sender.
3. Inquire about the postal system: You can inquire about your own express delivery information through the website of the State Post Bureau or the mobile phone client.
4. Call the police: If your courier is lost or illegally occupied by others, you can report it to the public security organ and let the police handle it.
In short, under any circumstances, we must ensure our privacy and property safety. We should be vigilant when receiving unidentified express delivery, and don't easily open packages and consignments to avoid unnecessary losses.