As far as Sutter goes, the muskets he purchased from the Russians along with Fort Ross were "used in the time of Napoleon's invasion" (of Russia, 1812), if I recall correctly. It wasn't specified as whether they were French muskets left by Napoleon's troops, or Russian muskets used in the defense of Russia however. On the other hand, the Russian muskets were a general copy of the French ones of the period (1777), so they'd be close one way or another.
As of a few years ago Sutter's Fort had a great display of firearms from their collection, but some other display went in to replace it. I'm sure that the staff is itching to pull them out of storage again though, so hopefully soon they'll have some of their goodies on display again.
Cheers!
Gordon