Sadly, 80% of all silent movies are now considered "lost" (or "temporarily misplaced" as I like to say). Occasionally new ones are found, but that's pretty rare. As more eastern archives are opened some previously missing films may be found, but I'm not holding my breath.

Many early Fox films were destroyed in a fire in 1937. This was before the days when 16mm copies made the rounds of collectors and TV stations which really limits our chances of ever finding these.