Hey man, it's ok. They will eat when they are ready too. I have two boas that still have not ate and they are over a month old now. As long as they are losing weight and/or getting "loose" feeling, don't sweat it. In the mean time, just start looking around for a live source for a Plan B. Even if you have to drive to get it, have it ready.
Boas can take a bit to start on f/t. I have 6 or 7 that are still eating live fuzzy mice. I start all my boas with the first meal of live fuzzy mice because I like them to have a naturally strong feeding response. Most of them switch over to f/t by the 2nd meal or so.
Good luck!