Every time I have seen the boxes and cards come up at auction together, whether it be the Sport Star Subjects or the movie star Screen Star Subjects, the cards have been round-cornered. However, I have only seen the boxes and cards come up together approximately four times in the past 15 years, so that is not a huge sample size.
One other thing to consider is that these boxes hold 12 cards each. 4 boxes times 12 cards equals 48 cards which is the number of round-cornered cards. It doesn't make sense for the 24 square-bordered cards to have gone into four different boxes -- boxes labeled as Series 1 through 4.
--Tim
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