Your biggest challenge will be the 1978 Wiffle Ball discs. These are the ones printed on the sides of the boxes.
About 20 of the cards were printed on a sleeve that attached a single ball to the end of a plastic bat. Because of that format the cards all come with a huge factory crease since they were folded in an octagon shape.
After almost 40 years of searching I still have not been able to identify the full checklist of the 88 players advertised. I can only confirm about 82 of them
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