This means that the courier company has registered the delivery status of the parcel in the system and confirmed that someone has signed for the courier. In practice, the sign-in can be made by paper signature, electronic signature, SMS verification code sign-in, and the system default sign-in after the self-service pick-up of the express cabinet. If the courier shows that the parcel has been signed but not actually received, you should contact the courier company as soon as possible to check and verify.