Sometimes a "perfectly fine and calm" snake is actually one that's not feeling well. Snakes are stoic, and when they're field-collected & then shipped, the stress
combined with all the parasites they themselves "field collected" can make for a perfect storm, lowering the function of their immune system. Enter the R.I.-
I think viper boas are very cool, but they're aren't common...I can't recall anyone here that's working with them, but I hope I'm wrong...& I ESPECIALLY hope your
vet can successfully help you get this one healthy. Be sure you also check for mites...that's the last thing he needs to contend with now.