I would search the area near your set up....
Believe it or not, they don't travel very far, very fast...
Just look again around dusk...
and then again late at night... if you know your snake's pattern, this helps a great deal...
I've had two escaped snakes in the past, and both were found around the time I knew they would first get out for the evening and explore in their vivs...
good luck... and don't give up hope....!