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A friend of mine actually did food photography for a while. In the US at least, the actual item you're selling has to be real in the picture. Doesn't mean they can't make 400 chicken patties and pick the very, very best one for the sandwich, and select the finest leaf of lettuce from the field, but it has to be real food.
Actually, some of the images on the packages match the food inside pretty closely. Although if I ever bought the shrimp salad based on the picture on the bucket, I'd be pretty disappointed.