Subject: Thievery
Message:
Hi [name removed]!
[Name removed] tells me that I should let you know of some shenanigans that went down. I had 2 microwave meals in the freezer last week. They were there Friday before I went home sick. Today, they seemed to have vanished. I am understandably annoyed. As in, I can't promise I won't pelt frozen apple blossoms* at the offender. In fact, I'm drafting plans for a trebuchet right now.
I've attached an image to further detail my feelings.
Thank you.

Attached image:

*A pastry-type food, often stored in the breakroom freezer.