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boxingcardmanA lot of card issues that were promos were issued in waves so that customers would come back. Others were event-driven; the card advertised or was given out at a special event. Perhaps some cards were issued as part of promotions like that and the remaining cards were leftovers, which creates a surplus of certain cards now. Or perhaps there was a redemption or prize associated with the issue and certain cards were shorted to prevent the prize from being won.