I like the idea a lot; reminds me of a school of photography whose main practitioner's name evades me right now, but yes, it works well with American subjects. I can't see it making much sense in Europe, but it does in America. In a way, sort of similar to Edward Hopper's eye, and interesting if one gets the idea, the sense of what it's telling us about expectations compared with where actual realisation gets us...
The second shot, of the empty post box, reminds me of yesterday when I turned up at the post office expecting to find my Leiter B/W double-tomes awaiting. Nothing there. Maybe today. But yes, a good theme if your eye can keep up with finding such material which may not be all that easy to do.
I also think that it's essential this be in colour; black/white would track it all to another train of thought, far easier to understand, but not what I think this is about.
Rob C