Similarly I found what was perhaps first film ever shot in China in the library of London's School of Oriental and African Studies (SOAS) back in around 2010. Can't recall the precise format but it was a situation akin to they didn't have a player for the film format and the film itself had not been retrieved from storage for many decades. The story about how it came to be shot was quite interesting, one of the French colonial administrators assigned to the Yunnan trading post was personal friends with the Lumiere brothers and had been given a camera and film to "go shoot some stuff". Upon further research the French family thereof had, in the late 20th century, tried to monetize the thing and had it buried. The SOAS copy, being free of their latter-day copyright bullshit, was the sole free copy outside of their grasp. I was able to come back some months later, after the SOAS alumni volunteered funded to have it digitized, to a champagne soirée viewing - we had, after all, beaten the frogs.