Agreed, don't panic!! And don't throw anything around if your room is cluttered, s/he might be hiding under a pile of something and you don't want to harm him/her. I'd set up a few hides or a nice warm spot and see if s/he comes to it, or put a mouse/rat in a hide and see if that draws him/her out. Look under/around EVERYTHING, even if you think they'd never fit. My RTB got out once and she turned out to be under my mini-fridge, which I would NEVER have thought she'd fit under. If she didn't poke her head out I would've never looked.
I've also heard about someone using a non-toxic type of mouse trap that has something akin to glue on it instead of a spring-snap. I'd be VERY careful and do your research before doing it, but it could be a good way to catch him/her if there's a lot of places s/he can crawl in and out of.
It helps that BEL's are stark white, s/he should be a lot easier to spot than most! Good luck, I'm sure you'll find him/her in no time!
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