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If you walk around to the back side, which is generally exposed and doesn't need a key to get to, there should be a bunch of doors that are either unlocked or locked, and a keypad. I wondered the same thing myself about 7 years ago and, when I saw the Yamato guy, asked him to show me how he did it. :)

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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.

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