No one likes a lunch thief, especially if it's the boss's nepo baby son. This employee worked in a small office of about ten people, so when it became clear that there was a lunch thief among the team, it was pretty easy to figure out who the culprit was. However, to ensure that there was proof, the Redditor had a plan. He brought blue food dye to work and left a few drops in a coworker's half-eaten yogurt. This coworker had complained that the mysterious lunch thief had eaten almost all of her…