Sent a Peculiar postcard to another member of the challenge. Fly, a peculiar card from my hometown is going your way!
I have found no maps of mailboxes for Mexico, so that means I’m using word of mouth to find new places to post mail. A friend told me that there’s a post office inside a Federal Courtouse. After much asking, passing through metal scanners and searched to the inch of my soul I Showed up there today and even though it’s only supposed to handle federal paperwork they were amused and accepted to process my postcard. They don’t sell stamps, luckily I had some left.

curious experience, but I won’t be able to use this office/mailbox again