u/LegitimateFig5311

Hey all. So I work at small shop with only like 5 guys. One of them is leaving for a new job in a couple weeks. Hes well liked and everyone at the shop gets along. He wont be starting his new job for a couple weeks after leaving. Were wanting to pull a prank involving putting something in his toolbox for him to find at his next shop. Strictly harmless and in good fun. Nothing that will destroy his tools or toolbox or get him in any sort of trouble. Any ideas would be great.