One of the things that may work to get him interested in feeding again is to try and get hold of some live rat fuzzies (also known as rat crawlers). This is the stage right before their eyes open but they are fully furred - about 10 to 14 days of age. Since they have little to no erupted teeth at this point they are quite safe to leave in overnight with your snake. I know most of my adults just can't seem to resist a chubby rat fuzzy and I often use those to kick start a feeding response. A couple of those don't really make a meal for a bigger BP but if they "snack" on them it does seem to get their mind back on feed and get their digestive process re-activating after a fast.