These are print waste that was removed from the facility, NOT inserted in any packaging type.
They have appeared with frequency on ebay over the last few years.
There are no known variations in player combos. 528 cards for 1990 Topps football means that there are 264 1991 Topps baseball subjects who are not available with the football back. aka 4 132 card sheet from 1991 MLB were printed with 4 132 card sheets of 1990 NFL.
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