fan fiction would be highly unlikely, as you wouldn't be allowed to register a work that you didn't have the rights to, and even less likely to have been done in standard screenplay format. i don't recall off the top of my head, but i'm pretty sure that they were all dated during MV's prime time run, and not after cancellation.

most of them were listed as "spec" scripts, though, and i'm pretty sure that a show staff comes up with more than the requisite 22 episodes per season, in case they run into production problems with one or more of the ones that were initially selected to be produced.

these are the ones i know are out there somewhere, and that someone out there knows something about at least a couple of them.