From what I've read, it appears that they're 
impossible to find, and the only cels really 
available are those sericel remakes that Gainax 
released.  If that's the case, how can sites 
like http://www.storage.asylum-
anime.com/cels/evacels/ be selling so many 
production cels? Is there an easy way to tell 
what's real and what could possibly be stolen, 
forged, etc?