I read through the entire 70 page thread about the frogs. His posts there made me not want to contact him at all. The only reason I emailed him is because the vet tech at the necropsy clinic suggested that I ask for a refund of the snake's price. But it only confirmed that he actually did lie to me.
Personally, I would have contacted him regardless of what a Fauna thread has said the second I found any information that would have said something other than what I've been told. Do you have any receipts that can verify that he had said CB?
Also, I find it strange a vet tech would suggest that after the snake was in your care for a month.

Again, personally, I would have done a significant amount of research before purchasing a high dollar animal like that. It does appear that no Madagascar Hognoses are produced in the US, unless my googling skills are out of date...
That being said, please do not let this deter you from getting another at some point. I am also in Arizona, and if you need help finding a reptile do not hesitate to private message me.
Also, before I forget, do you have the other set of paperwork from Arizona Exotic Animal Hospital that could show us what kind of medications were used? When I went recently I was given a sheet that told me what medications were used, following up on dhaisten's comments.