Well I wrote the note, it made me feel better.

Next time I'll hide my food in a bag and put my name on it, notes that say "do not steal", whatever. I just wasn't thinking about it even though I've had some co-workers who had stuff stolen recently.
It would have been bad if I had gone to dinner just a tiny bit later, the cafeteria was almost closed! I would have had to totally go without in that case. (Other than my apple that was in my locker.)