not going to look for it on XTwitter but there was a funny story of someone whose cat got out of their house or apartment and was soon found and returned, and then a day or so later their real, nearly identical cat, returned on its own so now they have two cats
That DID occur to me -- and it would be an excellent explanation for why the cat had bulked up! -- but I didn't think of it until I'd already posted the wisecrack. 😄