Just mispel a word, replace a vowel with a numb3r and the wordlist is useless

valid concern, but this was not in the US

For mail one method has been to scout out a house, the have mail sent to it. Pick it up from the house. (Nobody home, before owners retrieve it, etc) - this is illegal and considered theft of mail

An empty plot might be a better idea, I had an acquittance who installed a mailbox in an empty plot on his neighbourhood and had stuff sent there.

7z is better than rar and its algorithm is fully open source