Biggest sigh of relief ever! I had torn nearly half of the closets contents out and moved a box and sure enough, he had wedged himself between the two boxes. *collapses to ground* omg......I am so relieved. He is now secure in his tank. I double checked and rechecked then went back a few seconds later just to check again.

I'm going to spend the next week or so snake proofing that room and organizing that closet so that if this ever happens again (which it won't!) it will be easier to find the snake.