He won the lottery 6 times, and on similar dates, after working for the lottery? Why did he think he could get away with that? There are so many opportunities for him to cover his tracks and he missed pretty much all of them...
It could be dumbness, but it's also a common trait in high IQ people -- I've read stories and know personally lot of them who end up badly, similarly or otherwise...
Still, randomness being random, one day should happen that there are too much winers some years. Else, maybe the cheaters are on the other side of the game.