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Todd SchultzLew Lipset sold a group of 11 different in April.
http://www.oldjudge.com/auction/baseball/sets/92/
In the description, he claims that only 11 different cardboard Butterfingers exist, and he identifies them. He is mistaken, however, as I personally own at least 2 others--a Frisch and Tex Carleton. Still, no one has come forward, to my knowledge, with evidence of a complete set, and since they're damn hard to find as it is, asssembling such a set would be extremely difficult even if every card was produced with the ad front.