Good luck finding your snake. First, I would check anywhere that would be especially warm (Underside of a computer or electrical equipment, etc). They tend to hide somewhere warm and dark and fairly enclosed. Your snake is also more likely to come out at night when the room is dark and relatively quiet. I am sure other people will post with some more concrete ideas, but those are the first things I would do/places I would check. My first snake got out of her cage once before we installed cage clips and my roommate found her curled up under a laptop where it was warm and cozy.