Mmmm, that's a regular occurrence in supermarkets @postman
While shopping in Tesco here, one invariably sees half eaten sandwiches, open cans of drink, open boxes of chocolates and the like dotting the shelves at random. I guess the major retailers factor the losses in, but really, this shouldn't be happening.
One particular incident that sticks in my mind was a box of Roses that was in the dry goods yellow sticker bin. It was in there because the box was dented, and every time I went to Tesco, there were ever fewer chocolates in it. By the time it was finally cleared away, the box was empty...
I've spotted your problem, Reynard.