Ah, yes, I remember well.
And as for the Laundry detergent that had free glasses, dishes or towels hidden inside the box, well, depending on what your Mom needed, you learned to pick up the box and guess, simply by the weight, what it contained. Glasses were heavier than towels, but some of the dishes were about the same weight. So sometimes it was a guessing game and no one could tell what the prize was, the needed extra cup, or a cereal bowl like the 17 of them you already had.