VGC has the Wii U at 7.34m as of October 4th compared to 7.29m shipped at the end of September. This mean we have sold > shipped 50k.
Overtracked at least 300k. If not more.
As I suspected, looking at Nintendo shipping info it's Europe that is overtracked.
VGC has end of September
XB1 sold 5.75m Vs 7.3 - 7.5m shipped
WiiU sold 7.34m Vs 7.39m shippped
Obviously one figure is overtracked and one under!
The gap end of September is likely around 800k, leaving 1.1m - 1.3m XB1's on shelves, and 300k WiiU's on shelves.
Factor in the rest of Oct 4th sales, Oct 11th and Oct 18th (230k in total) and that 800k gap decreases to 570k.