This was in Canada, but about 10 years ago, I wanted to test this.
I wrote an apartment number and a postal code (that I was pretty sure was unique to that building) on an envelope and mailed it.
The US equivalent would be closer to an apartment number and zip+4.
The envelope was received. No name, street, or city.
I now live in the US, and my zip+4 maps to a portion of the floor in my building. I suspect my last name and zip+4 would be sufficient, but I’d be more comfortable with my apartment number and zip+4. But either way, it uniquely identifies my mailbox.
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