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.
Only the individual bar wrappings were the standard clear plastic (stronger and more rigid than cling film), the two and four pack wrappers were the folk-like wrappers that you would see on Kit-Kats and the like.