Several of the cats I had when I was a kid and now as an adult just came up to my door and started meowing. It’s like God was informing them about which house was most likely to take them in, after some online posts and flyers with no picture (so they have to verify what the cat looks like) that say "lost cat found, contact here ( ) " and putting notices in at the vet and the local shelters, we kept them. My guess is they were all dumped somewhere in the neighborhoods I lived in.