Didn't realize this, you probably got plenty of resources there. My best advice for now is to keep him warm(leave the hot spot at a slightly higher temp such as 92-93 for a bit) and well hydrated. Out of the few boa rescues I have had my finger in, dehydration and less than satisfactory temp gradient have caused a bunch of problems. If you need anything else, I have a link of another forum with a few vet techs and a few guys that do rescues like this all the time.