I say parade the office knitting needles in hand and demand to know who the bandit was who ate your pizza and demand that he/she buy you lunch!
Just another example of the soul-less Corporate America.
Birch looks great!
Here's an idea: Post a note on the freezer saying that you really need to find the person who took the LC pizza as it was part of a scientific experiment and they may need the antidote.
I always brought my lunch to work in a lunch box with an cold pack just to avoid "the disappearing lunch" problem. Really how immature! You didn't put it in the fridge so obviously you know it's not yours to eat.
One lady I use to work with kept having her yogurt taken so one day she put hot sauce in her strawberry yogurt and left it in the fridge. The guy on the second floor couldn't even complain when he got a mouth full of hot. Last thing he took from her. LOL
Man, that SO sucks..................
It happened to me at work also and we are definitely not corporate--sometimes people are just not nice.