Congratulations on the finds. That revolver should prove to be fun to own and shoot. Enjoy them in good health. I would love to see a photo of the revolver.
I had a similar find about 18 months ago while cleaning out my garage rafters prepping to move from Idaho to here. I found a rifle, a shotgun, and a Crosman pellet gun. I still have no idea where they came from. I had the house built, and have obviously been the only owner, so I must have put them up there at some point in time, but the how and why still escapes me.