I found an old Playmobil box (full, but taped shut from top to bottom and sideways) in a thrift shop. It was priced €35 but it felt heavy and looked promising, so I took my chances. Alas, the content wasn't quite what I had hoped for: most of the rarer pieces are missing. No bell, no rooster, no balcony, no wooden railing or railing connectors. I did get parts of a yellow house, a surprising number of (new style) floor boards and some cool old accessories.
I was still happy to see this type of thing pop up unexpectedly. There is still treasure out there!