rural mail pickup arizona 1940s
RFD arizona 1940s
OK, so Character A is a scientist on a fictional WWII-era military research project, and he wants to send a message to Character B without his superiors knowing. He knows his own mail is opened and read, but security is otherwise pretty lax -- he's previously been able to leave and come back without being caught. Can he simply slip away, walk to the nearest farm and put his letter in their mailbox for pickup with the rest of the mail, or is there some reason this would be implausible? He'd have to leave off the return address, but I don't think they were required in those days, just recommended.