Yup real easy way to find him
Lay out a rock and point a heat lamp at it. Leave it in the last place you saw him, he/she should come out when it senses the heat. Just make sure you watch the heat lamp in your house so you dont start a fire..
I found my Bearded Dragon using this trick. Heating pads are ok but the snake will be attracted to the UV and Heat from the Bulb.
good Luck
-Dux/Doug