It will look like a regular key. It has just been designed to fit specifically into your post office box.
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It is a Post Office Box. Instead of having something sent to an address of a place, you can organise a post office box through your post office and the post will be sent there. You can then collect it. It is a way of keep an actual address private.
There is little difference between putting a letter in the mail box verses dropping it off at a post office. It does save the time in having to queue for a stamp if the post office is busy and you can put a letter in the mail box even when the post office is closed.
Yes you can. The post office apparently places a notice in the post box for the owner, to sign for a registered mail at the counter.
Post Office boxes come in many sizes.
Mail boxes can be applied in your nearest post office. If you have a local post office in your city, that would be where to start if you would want to have a mail box.