We had a roommate stealing food situation too. There were 4 of us, the first 2 didn’t have their food stolen before, I’m the 3rd one moving in but whom everyone could see I buy my own food, and a 4th guy who moved in around the same time as me but always hung out in the living room. It was obvious who was stealing, but none of us had proof, nor was there anything we could do about it anyway, until I had a flu once and decided to buy orange juice to be healthy, but because it was for only me, I drank straight from the jug. A few days later the 4th guy and only the 4th guy caught the flu…
https://www.reddit.com/r/PublicFreakout/comments/jlf1jm/ever_had_your_lunch_stolen_at_work/