Your street address is what you use for all mail - including FedEx, UPS, etc. No one need ever know which box is yours at the postal station. You only need to know the number so you can find it to get your mail out.
There are several services in TV that watch empty homes and/or manage rentals. Do a search on this site and you should come up with some good info on those services. You will need to arrange for things like grass cutting and some utilities (water and electric for your sprinkler system, for instance) even during your absence.
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