God I hate these people that think just because a snake eats rodents that it's gonna automatically kill babies, eat your little yappy dog, your cat (not that I'd complain if it did but that's another story lol) along with every other small animal in a mile radius, and rape your mother. Ferrets are bred to kill snakes! in 9999 out of 10000 cases of a snake getting out I would be more worried about the snake getting hurt than any other animals in the house (unless you have a mouse infestation or a rat colony the snake can get into).
That's why I won't get ferrets until we can have a whole room dedicated to just them. For 1 they need the space and 2 if one of my snakes worth hundreds of dollars ever (God forbid) got out and got near the ferrets thinking they smelled like food they would tear him/her to shreds.
Sorry I'll get off the soapbox now lol. Don't give them back though that's just stupid them thinking they can give you something then take it right back after you drove 1.5 hours and bought all the carp.