What about the millions of X360 dead and replaced because of RROD? Do those count as shipped like the rest?
I know the fat PS3 was much more reliable, even at launch. During the first two years X360 apparenlty had a ~24% failure rate compared to 10% for the PS3.
http://www.squaretrade.com/htm/pdf/SquareTrade_Xbox360_PS3_Wii_Reliability_0809.pdf
Because if that was the case, it would mean the Microsoft X360 shipped numbers would be overtracked compared to PS3 numbers (like the famous 80 millions shipped numbers).
EDIT: Just thought that maybe it's possible to repair a good deal of the RROD units?