DLena
Corns are goram shiny!
I have purchased quite a few corns from Don, and I've never had a single problem with any of them, health or temperament, and they are always as advertised and/or pictured. Paying vet bills and offering to take the snake back on his dime, when it is, most definitely, husbandry issues at the OP's end that has caused these problems, further shows his professionalism and love for these animals.
If Don, a near-legend in this hobby, is giving you husbandry and health advice, and the OP is not following it, then the consequences are on her, and, unfortunately, on her snakes.
If Don, a near-legend in this hobby, is giving you husbandry and health advice, and the OP is not following it, then the consequences are on her, and, unfortunately, on her snakes.