I'm going to take a guess and say that the first four "batches" that were sent out were actually part of a mass 198 key batch that Blizzard sent WoWI. They were sent out in waves probably because the contest was new, and word didn't get around quick enough. Thus, they wouldn't send out all the keys since the tracking numbers weren't even claimed yet. Since the next 210 keys were sent out more than a week after the contest had started, it would make sense that there would be at least 200 more authors waiting for a key.
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