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There's nothing more frustrating than finding that the ham sandwich you brought for lunch has mysteriously disappeared from the office fridge. Then there's the pilfering of milk (a splash here, a splash there) by other coffee drinkers who think of it as "borrowing just a little." Personalizing your brown bag or milk carton by labeling it with your name and the date—thereby announcing to one and all that it is not communal—may deter a thief, but don't count on it.
It's almost impossible to catch a food thief unless your kitchen is equipped with a surveillance camera. Unless you see someone eating your sandwich and you can quietly say something to that person, your best option is to ask to bring the matter of food pilfering up at the next staff meeting.