Since it seems you know what room he's in, have you tried the plastic bags trick? This helped me track down and catch an escaped baby corn back in the day when I knew he was in the kitchen (due to crossing flour lines).
I placed plastic bags along every edge of the wall and along the cabinets (because they usually like to travel along a surface like the wall and the bags make so much noise). I sat up late at night in the living room in the dark and quiet. The second night, I heard the bags moving and there he was.
Good luck, I hope you recover him!
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