Thanks for taking her in! It’s likely his former family just abandoned him after moving or something; it happens all the time. 🙁 I have mentioned before on PoP that we did the same exact thing with a little boy cat back in the summer. Four Paws cat rescue put him into their system for us and that is how he found his forever home. We did foster him until he got adopted. I would suggest contacting them … they really love us for bringing him in off the street and hopefully they will have the same reaction to you. Good luck!