Kresnik on 16 January 2015
I can't find it now I need to, but I seem to remember ~60k PSTV sales in the USA in October and November.
Vita sold ~47k by the end of November according to VGC.
So I don't think they've bothered to track it at all since release. So there's some missing sales there.
Combined with the missing December sales, and there's the difference.
Edit: Got the figures wrong. It was ~39k by the end of November:
http://www.neogaf.com/forum/showpost.php?p=142914433&postcount=2267
Still, that means normal Vita sold 8k in two months, including Black Friday, so I'm still calling undertracking from there.
