I moved out of an apartment building in the US which had a system similar to this. Ours had no empty doors on the back -- carriers had to use the same entry pad

I moved out of an apartment building in the US which had a system similar to this. Ours had no empty doors on the back -- carriers had to use the same entry pads we did to deliver packages. Each carrier got a code which gave them access to the initial room, and entered the name/apt number of intended recipient. Annoyingly, it was a subscription service with no other way of getting package delivery securely to the building.