Honestly i have a female in my collection that will not eat any large prey, she is strictly a smaller rat snake, but that's not a problem for me. Also if i were you, i would find a local rodent breeder and see if they might do a swap out or if someone will buy those larges off you, which i sure someone would. Just get the right size, even if you have to feed more, some snakes just like a smaller prey. Most breeders don't even feed more than a medium rat to their ball pythons.