I've always thought different regions have an easier time getting certain pieces required to win so perhaps someone would like to trade to win big.
Haves:
200 series-201(one extra)
300 series-300 and 301(two extra)
400 series-400(one extra) and 402
500 series-501(one extra) and 502
600 series-601(one extra)
700 series-701(two extra) and 702
800 series-800(one extra)
Need:
200 series-200
300 series-302
400 series-401
500 series-500
600 series-600 and 602
700 series-700
800 series-801