Just read all of Oliver's story-glad to hear he's neutered.
i am sure kitties leave signs on the door, just like European beggars in the middle ages. "Keep away, fierce dog!" " Friendly landlady" etc.
Friends of mine always had cats. When they moved in the very center of Munich with their kitty, she was already very old and passed away a year or two later. They decided not to adopt anymore as they were 70+ and were afraid a cat would survive them. So 3 months later, a cat shows up in their front yard -he turns out to be a neutered tabby boy who looks just like Maunzi. They try to find owners-it is a neighborhood with quite some business places and not so many flats... Nothing. Now of course he lives with them. i think there was a sign at the door which said " Job opening for tabbies"