They usually dont go far. put out a heat lamp and turn off all the lights. look at night. remember they are nocturnal so they will hide all day and come out at night. another good one is... scent a box with the smell of a rat and check it and around it through out the night.
ive had about 4 escapes in the last 15 years of having snakes and these are some of my crazy methods lol
- put newspaper all over the floor in my room cuz thats where it escaped and listened for him to move around through the night.
- the scent box and spot light worked for me.
- the couches are another usual spot
- ive never done this but ive heard of it... tie a string to a f/t rat and leave it out. you might find the snake on a string in the morning. only in extreme conditions would i use that one tho