I'm not too sure on how long your BP will live, and I am sorry this happened to you.

When reading before you stated about the mice being on an oily bedding, the symptoms seemed somewhat similar to IBD in a way. But I know for sure it is not IBD because that can only be passed from one another or from having mites that carry a retro virus. It's most likely your snake was poisoned from the oily toxins left on the mice from being on those beddings. I think a good breeder would definitely give you another, but would you really want another snake from this breeder if the same problem will most likely happen again?