My building has individual mailboxes in the lobby for each unit, and then a bunch of large boxes that packages can fit in. The mail deliverers put a package in

My building has individual mailboxes in the lobby for each unit, and then a bunch of large boxes that packages can fit in. The mail deliverers put a package in, lock it with the key in the door, then put that key in my mail box, so I know to go get the package out. It's brutally simple, and I was surprised I've not seen an implementation like this before.