Yes, cards have been like that forever. I've never taken advantage of it, but I had opened up so many hockey card packs in the late 80s & early 90s I started to see the pattern. I generally opened up packs to make sets to sell. What sucked for me is when the packs were somewhat mixed up and I ended up with unbalanced boxes. I heard about people searching boxes for special cards, but I don't think it was too common.
That is actually a pretty slick app. It goes to show why you should only buy from reputable sellers.
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