I was just checking this yesterday, hope the links help.
Thanks for that.
This shows the discrepancy between internal shipments and "sales" (aka shipments to retailers)
This shows Sony's internal shipments on the left, & "sales" on the right for the FY end Mar2007:
Not sure if any consoles got counted twice, or not at all during the transition (Nintendo figures also used to be internal shipments but they transitioned in year 2000)
Interestingly in your first link you can see they regularly ship a large number of units in the September quarter, often exceeding the December quarter, which shows how early they have to prepare for holiday sales.