Personally, after my recent experience with RI, I'd get your snake checked out immediatly. Either that or quarintine it and try raising the temperature etc.
It's such a pain when snakes go missing! I thought I'd lost my Columbian Rainbow Boa for a MONTH once! I searched high and low, emptied my bedroom and searched through his tank about 20 times and even looked in stupid places like the toilet...turns out he was in teh tank all the time, the little rascal!!! He was just so small I kept missing him. If yours has escaped he'll be in the first warm place he could find I've never heard of BP's eating each other, so I honestly wouldn't worry. I know how distressing it can be losing a snake, so I really hope it turns up soon! Good luck!