Good for you to take him in and give him the chance at a good life.
It never ceases to amaze me how horrible people can be. I got a normal female in January, because the manager of my mobile home park called me up. She was inspecting an empty trailer and found " a big snake". She called me because she knew I had snakes.
I was a little nervous, I was afraid I'd find a retic or something, but instead it's a half frozen normal ball python. These people moved out of their house, leaving her behind, knowing there would be no electricity and no heat, they left her there to freeze to death.
She came away with a massive RI, but was darn lucky to even be alive. She was pitifully thin on top of it all, and because she was sick, she wouldn't eat.
Took a few months of effort on my part, but she kicked the RI, started eating again, and will be providing my husband with some spider babies this fall hopefully.
Gale