1. Missent: It is possible that the courier company made a mistake and sent the parcel to your address. You can check the recipient information and address on the package first to see if there is anything wrong.
2. Gift: Maybe someone gave you a gift anonymously. In some cultures, it is polite not to sign a gift. You can consider whether the gift meets your preferences or needs.
3. Fraud: Some people may use anonymous gifts to cheat or cheat. If you are not sure about the source of the gift, or feel unusual or dissatisfied, you'd better handle it with caution.
If you receive such a courier, you can consider contacting the courier company or the local post office for more information. In addition, if you feel uncomfortable or worried about this behavior, you can also consider contacting the local police.