Honestly 22 days is to long … you have the test results still I assume… which means even if theirs comes back positive the animal could have picked it up due to their negligence not yours. There is a reason we as breeders have a time frame for health guarantee… Once these animals leave our facilities (healthy) it is up to the new owner to do right by them. They should have been in contact after the first regurgitation imo, and then got proper advice to how to handle the situation. It is all He said She said at this point, and I don’t work with Hognose, but if the meal was to large plus the fact that they offered another meal so soon after of the same size screams red flags for me. Then to decide to not feed or contact you after the 2nd time is on them also.
Stand by your store policy… that’s what is for.