In the cracks and wedges of the furniture... -lol- (see my last post) Seriously though, look around the room and if you see ANY tiny holes, or places that make you go "he couldnt be there..." Look there. Work out from the cage in a radius, a little at a time. From what I've seen, MOST of the time, they're within like 10 feet of the cage. Dont forget he could possibly be above eye level too.

Good luck. *crosses fingers*