I will tell you what I do with everything in my collection and what I sell.

I offer F/T and if they will not take it I feed live. I keep doing this untill a few things happen.

the animal takes F/T

The animal is sold and the new owner knows it is on live

The animal is in my personal collection adn I have tried along time and it will not switch. Once you deal with thousands of snakes a year you learn there just are some that do not switch.