~!*Update*!~
Thanks for the help everyone! The ball python in question is about five feet long, around 1,600 grams, and is about as thick as when you put your hands in a circle. He is a very big boy :P
We are going to Jack's Aquarium and Pets later tonight to pick one one small live rat to try out. Hopefully he'll eat tonight. I'll keep everyone posted on if he eats or not, which I hope he does!