hmmm. tricky question... I'm no expert but this is what I would try. I would offer a fresh killed.... Well to back track a bit-

Generally if there is no noticeable weight loss your snake can handle his fast- some snakes have gone up to 6 months without eating though this is very rare and unless the snake is of a relatively good size potentially dangerous. If there is not noticeable weight loss I would wait five days and try offering a fresh killed mouse of appropriate size. Also as soon as he poops I'd take him to a herp vet to be sure there are no internal parasites - you're gonna wanna bring that poop with ya - here is a place to find a herp vet near you ... http://www.arav.org

Okay I would try a fresh killed (buy live and put in bag and smack is one method) make sure you are using tongs or something to dangle the prey as BPs tend to have poor aim when striking sometimes. Live feeders are generally a last resort - unless the snake was previously fed on live feeders - then you'll have to try to make the switch to f/t. Almost all snakes will eventually take f/t but a rare few will go their whole lives without accepting an f/t. If you are trying to feed back to back to back you may be stressing the snake out. Double check temps humidity and basic husbandry stuff and leave the snake in a quiet room to adjust to its surroundings with NO handling (unless absolutely necessary for some odd reason) for about five days, then attempt to feed a f/k (fresh killed). That's my advice but many people on this forum know more than I.