A few yesrs ago we had a cat that was black with a white patch on his chest. he was a 'people' cat and would make friends even with strangers. One day, he disappeared, the last we saw of him was running after some school girls who had been playing with him.
Days turned to months and we got another cat assuming that he had found a new home.
About two years after he disappeared, I was glancing through the local newspaper, and saw a story about a mentally unstable woman, who lived in the local area, but also had a council flat in another area. She used the flat to keep her cats, hundreds of them, all black with white patches on their chests. The newspaper story was about the flats neighbours complaining about the smell and noise and the council, breaking in to find all these cats, which now needed new homes or would be put down.
The sad thing was, we now had a new cat, who wouldn't take kindly to an adult cat coming into the house and even if one of those cats was our original cat, we wouldn't be able to recognise it as all the cats in the flat looked alike, and it probably wouldn't recognise us, given the time and truama.
So we suspect that we know what happened to our cat, which was some kind of closure.