I don't think it's overtracked in Europe really. It HAD to sell out the other shipment for it to get the Platinum edition. Retailers wont order more copies of a game unless they can/have sold out the other versions. (Especially with a profit)
If we say it's overtracked here by 400k or so, that would put the game at 6.3 Million units Worldwide. This would mean it STILL wouldn't have sold out the December shipment, almost a full Year on.
I don't think that's possible.
If it was overtracked by 400k in 2010, then it's been undertracked in 2011.
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... the problem is with these adjustments I lost my tracking history.