The first point to check is the amount of mastercoins bought before 1.9.2013.
My calculation is available on:
http://pastebin.com/HiPVUxzTwhere you can see on each line:
- the block on which the tx was confirmed
- txid
- amount of satoshis
- amount of mastercoins (+ the calculated 10% bonus per week)
- the amount of seconds the tx was sent before 1.9.2013
Summing up the amounts gives a total of roughly
528,301 Mastercoins (or 528301.88871472 to be exact).
superfluouso calculated a total of around 554,297, so we do have a discrepancy here.