Each bar is wrapped in cellophane, which are then wrapped in the normal outer packaging. To make the 4 pack, they simply took 2x two packs and put them on a cardboard tray,and then wrapped those.
I don’t think I’ve ever gone through so much unwrapping for candy.
I’ve always wondered why they use so many as well! I assume it’s each group of items that a single shopper pulls goes into one bag and they have one shopper per like four aisles or something. I have nothing to base that on though, whatever it is it’s a ridiculous amount of bags.
If you get delivery they will sometimes put three or four bags with a single item each all into another bag so they can carry it easier.