They usually don't travel far. Where do you keep him, in a bed room? Check closets thoroughly! Those are always dark and usually contain a tight crevice for them to feel protected in. Also check for cracks between furniture or cabinets that they can squeeze through and have a nice spot to hid in.
My old garter snake (way different snake) would escape for days at a time, but would always come back to her cage after a few days when she was hungry. Have patience, you'll find your pet eventually!
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