Don't know of any missing videos, I'll check that out.
I do know that some of the videos on GVH 1 & 2 are the original versions. For example, the uncensored "Bicycle Race" is on GVH 1, while on Greatest Flix and other VHS collections, it is not. Though "Fat Bottomed Girls" on GVH 1 is the single edit, and the FBG on the Queen Rocks VHS is the album version, with the added guitar in the beginning.
That's all I know for now, but I'll keep looking...check here: http://queenvideos.cjb.net
they might have answers
We can only grow the way the wind blows
On a bare and weathered shore
We can only bow to the here and now
In our elemental war
- Rush, "The Way The Wind Blows"