We've just got a new Corn at collage. Shes a rescue from the RSPCA. They found her in a guarden in Leeds. Shes covered in bite marks because her stupid owners had been feeding her live prey . So they just dumped her because they didn't what to pay the vet bills. Its going to take ages to get her better. Some people are so stupid.
Unfortunately there are many irresponsible owners out there. At least the RSPCA have found a new home for her and she was not euthanased. Good luck in nursing her back to full health- hope she makes a good recovery.
If the marks are only minor injuries then don't worry too much. Reps heal really well. It'll take a lot of time, but it seems you're the right person for the job of making him better.