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davidcyclebackI would assume they do. They aren't really proofs, but are recognized in the hobby as legitimate cards. All the major auction houses recognize them as legitimate cards.
As you mentioned in the other thread, these cards are a bit mysterious. However, similar small cards were inserted into candy boxes. Best guess is it's a candy card, which would mean there's a chance it was issued by the same candy company that made the Colgan's Chips.