Just wondering...
But if you bought 3 snakes off a breeder and 2 won't eat. Why would you go back and get 2 more?
First, contact the breeder and tell them you can't get them to eat. Ask what he/she would do.
Second. Kill the two rats you have and pop them into the hide with your two bps who aren't eating. If they don't have hides, gently put them beside them. Close them up and leave them in there for the night. Betcha they will be gone.