Yeah - I just found that tape now. It was advertised as from the Briebart tape. That tape has nothing on it. Except it was edited. Maybe there is more on the edited portion ...
Thats been my theory all along - they probably have the rough master footage of the entire event, rather than the edits that appear in that youtube video. And maybe more from the Harvard days.
But -the point is, this probably isnt going to be some secret video - obviously who ever made the YouTube video was able to access it even before the 2008 election.
Im sure Harvard has some sort of media archive - so perhaps all it took was somebody actually taking the time/figuring out how to access it.