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Form NeoGAF:

The only people who have "real numbers" are no one, because there's no industry-wide tracking apparatus except NPD, whose biggest subscribers for video game sales data are the platform-holders and publishers. If a company reports sold-through numbers in the US, and they're not made up from whole cloth, they're NPD figures.

What was the servic that Nintendo started that actually does exactly this, tracking sales down to the unit by their serial numbers? SIRAS? SOmething like that.