Please reopen my thread:
http://atrl.net/forums/showthread.php?t=505263
As I already told Matty, the old audio floating around since 2012 was made by a BritneyBoards.org user named Teckkie when he got the pro tools session from ACapellas4All.com and then he also did a fan-made raw Britney A Cappella. He alo leaked the First Britney BTI Demo with raw vocals and did the "Can You Take This?" Intro version.
The file that leaked yesterday is the Real Deal 2006 Demo by Keri Hilson, you can tell this because the 2012 audio uses the Album Version Instrumental and the bridge isn't properly set up, Teckkie used single audio layers from the PT Session and arranged them in order to suit the Album Instrumental.
If you carefully listen to both (2012 fan-made and 2006 leaked demo) you'll notice the differences. The 2006 Demo uses original Backing Vocals for the verses instead of the Album Mix BGVs that Keri did for Britney's verses and it's clear during the 2nd verse. The Instrumental from the 2006 Demo is also unpolished and more simple.