O.k. well put your face on the ground and look. Everywhere. They like to hide in dark places, sometimes in cooler places than you'd expect, sometimes warmer. TVs, computers, etc.
This guy is five feet so it will be easier than finding a baby. You could try the rat idea, he might go for it.
Normally when people loose snakes, they look and look and look and a week or so after they start looking the snake shows up right in front of you. It happens a lot.