I've been trying to find some older minus8 videos like the one with the for Pac-Man Ghost Girls and I can't find the actual video. All I'm finding are screenshots and messages that "this video is not available in your country". Any ideas where to look for these apparently missing videos?

First, try using the dedicated & pinned thread for requests like this, see topic #23835.

Second, be more specific on what you're trying to find? There is this Pac-Man Ghost Girls video on Youtube, but I am not sure if that is what you are looking for.
Looking through other image galleries may also yield some results. Alternatively, you may also check through the sources and comments of deleted Minus8 posts for clues.