Carl, we can all rejoice that the grand old rifle has found a good home at last. The break may have occurred when someone tried to pry the lock out and broke the wood doing so. Well, it is a grand old thing, and good on you for having it!
I wonder if the second gun you posted, the half stock, isn't a deluxe edition of the usual plain half stocked gun that seems to show up at every gun show. Some of these are stamped US and are thought, by some, to be Indian treaty/ration guns. I don't think that this has been proved, but it could be. This gun looks like an original percussion even though it has a two bolt lock. I couldn't see any filled in holes in the plate and the engraved border around the plate is continous; not broken at the bottom where the feather spring was mounted. Usually, the line is interupted at that point on a flint lock. I guess that they felt that since no one could see it there, why do the extra engraving.
Again, thank you and it is a pleasure to correspond with you once more.
Regards-Dick