I sent him an email and he said he's never had an issue before. I do believe him, I've seen his rat racks and breeders and everything was clean and well-maintained. He said he's going to check them, even the frozen ones. I'm certainly not worried about the condition/health of the feeders. As long as I know they can't spread to my snakes, I'm satisfied. Hopefully things will be cleared up by the next batch.