At my old job, I was good friends with one of the admins. She brought lunch to work one day, and on the tupperware was clearly her name.
She told me that when she went to get it, the tupperware was gone. So she went around and saw someone eating from it. She confronted the person saying that it had her name on it, and the person still said that it was her lunch.
WTF? Some people I just will never understand.
I would go with the laxatives route. Don't make a scene right now, so the culprit won't commit the crime again. Just make a nice lunch tonight, fill it with laxatives, and then bring it in tomorrow.
Then when you see someone missing from their desk because of numerous bathroom runs you'll know who it is.

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