What sales are missing? I didn't see anything about that? Why would the official Nintendo numbers have sales missing? You got a link or something where Nintendo says their official numbers don't include some regions?
The image is in the original post of this thread...
The reason why Nintendo's sell-through numbers aren't all-inclusive is because not all countries have the same reliable sales tracking firms, plus Nintendo itself doesn't have an offical subsidiary everywhere, so their internal tracking isn't applicable worldwide.