He is most likely still in the room where he escaped. Check under and behind everything, no matter how small. I found an escapee behind the drawers in my desk once, and another was inside the foldout couch (as in, inside the backing!). Placing a heat pad (regulated) where he can get to it could attract him, also, and make sure to confine your other pets away from that room, so they don't find him first.
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