Topps reused loads of stuff all through the 70's.
Especially just a couple years later.
79 baseball with 78 backs
79? Baseball with Mork and Mindy sticker fronts on the back
Bazooka boxes with 78 baseball backs inside
same with black hole card backs
It seemed like anything leftover was turned into something else, or used to adjust the equipment. (I have all of the 4 above, Don't know the source for the mork and Mindy, the 79/78 combos were supposedly a dump find, and I bought the Bazooka boxes at retail in a grocery store. )
In general they overproduced so there were always leftovers.
Plus they made up reduced "fun" packs for Halloween either using leftovers or returns. 74 was a big year for that. I can easily see them using up a few rolls of still leftover wrappers.
Steve B
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