Cool story. I don’t know a single person in my area with a letterbox let alone a locking one. It’s just not something we have in the more rural areas.
Unless this is a language thing. To me, a letterbox is generally attached to a house, often it’s just a slot on the front door. And a mailbox is on a post near the street (and generally they do not lock)
Please explain? After doing some quick googling, it looks like my interpretation is pretty accurate. But again this could be due to localized results. I’m not going to pretend all English speakers use the same words for the same things.
You could drop the hostility though.