When I was a student I lived in a large student apartment building. Packages were regularly delivered to whoever was walking into the door at that moment or the first doorbell to answer, if the intended recipient was not home.

Then the person who got the package posted on an internal facebook page: "I've got a package for 304 in 605" and they would be collected.

The system worked perfectly and there were a lot of packages, I guess many potentially worth a lot.