Now we are to the vintage SW promotional sets that I haven't even finished yet, but plan to.
Star Wars-themed Dixie Cups were always a thing, from the very beginning of the saga. They continued through RETURN OF THE JEDI, and many styles were produced, in many, many boxes, which featured cool artwork and cardboard items that could be cut from the back of the boxes.
|Card 2 Front|
In 1981, to further promote THE EMPIRE STRIKES BACK, a series of "Story Cards" were included inside "specially marked boxes." The cards, if you can call them that, were really just heavier-stock paper, and small at that, and came in strips of four. The idea was, you could assemble the entire set, and send off for an ESB poster that had spaces to attach your cards. The completed poster told the story of the film.
From what I've read, the strips were pretty random, and I'm sure it was hard to complete the set. The mail-away poster also included one of two OTHER 4-card subsets (I think one was Rebel and one was Imperial?), making completion even more difficult.
|Card 6 Front|
|Card 8 Front|
|Card 14 Front|
|Uncut Strip: Cards 22, 12, 5, and 15.|