The rumours spreading among my friends who have relatives working in Mustang, a group of researchers have found frescos that are older than those on the movie,somewhere in the deep Mustang. It's NOT been revealed for secrecy and for further studies. We do not know the condition of the painting, but it appears they're in real good shape, not needing any restorations.You'll hear about it soon. Trust me.

Make sure you also watch

Mustang: The Hidden Kingdom (1994)-narrated by Harrison Ford.

It shows in brief about the relationship between Mustang with Tibet. A must see.