That's a lot of snake, & really handsome. So I hope he does well for you...most healthy snakes that mature in the wild aren't keen on captivity, but sometimes with an older one that's slowing down, you get a sense that they welcome the "easy life". I've met both kinds myself. Wasn't into capturing snakes to intentionally keep, only kept those few that had issues & needed help, or that were in captivity too long with someone else that no longer wanted them, & they were then illegal for release.
It's late night here, but I hope others that have experience with retics will chime in- I suspect they will.