Ok well here's what I found in the 2005 financial report you linked then.
Page 29: "Since its launch in September 2001, worldwide cumulative units sales have reached 18.5 million." as of March 2005. VGChartz Hardware *Shipments* page lists GC at 18.51 million shipped units as of March 2005.
Pages 33-34 show "Cumulative Unit Sales on a Consolidated Basis"
Page 33 shows 3.8 million GC sold in Japan as of March 2005. VGChartz says 3.8 million GC shipped in Japan as of March 2005.
Page 34 shows 10.46 million GC sold in the Americas and 4.24 million GC sold in Others as of March 2005. VGChartz says 10.46 million shipped to Americas and 4.25 million shipped to Others.
Do you still think that Nintendo's "sales" are really not just shipped to retailers? Yes GC sell-through was at 3.74 million in Japan at the end of March 2005, but 60,000 consoles on the shelves is actually a lot when you're only selling 4,000 a week as the GC was in Japan at that time. And as you can see VGChartz has the hardware shipments at exactly the 3.8 million that Nintendo reported as sales.
VGChartz Hardware Shipments as of March 2005