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Nothing to do with the code. At the beggining, they were coming out in waves of the same year/era all at once,
but I believe Topps redid their coding to fix this.
At first there were strings of 1950s cards that people would wait for and jump on. I reedemed one when the last 10 cards were all 90s and 80s, and I got a 1953. It's pretty random.