@edgarblythe,
Oh yeah, and around here at least, they're quite bold. I got a call asking for the equivalent of "missjoe" All bright and cheery as if he knew me, which tricked me into asking who's this? I had an unlisted number for 30 years until a couple of years ago when we switched it to mrjoe's name, so more's the mystery how he got it and knew to shorten my first name.
The letters are specifically addressed to the both of us, and the neighbours get the same thing. Not just flyers, of which there are no end. Real estate prices are so stupidly high, I'm asking myself what the fukc is going on?! It beggars belief.