A couple of notes, surmises and questions from a neophyte:
1. The outline of the patchbox does look like a refined version of the patchbox on #42.
2. The "nick and dot" border engraving is very small and well executed. I did not find many (if any) borders like this in looking at various North Carolina guns in the books that I have. In particular it does not appear to be a border used by any Volger in any of the guns that I reviewed. Is it possible that this engraving is the work of a silversmith and not a gunsmith?
3. Also regarding the patchbox, note the small projection in the lower rear corner of the box - it almost looks like the tip of the screw or a button. However, it might just be some corrosion.
4. Are my lying eyes fooling me (again!) or is the toeplate not a separate piece but rather the end of the buttplate that has been bent over? This doesn't seem right but I just can't see a clean line or seam between the buttplate and the toeplate. Note that the auction description of the reused gun furniture omits mentioning a toeplate ("utilized the coin silver patch box, buttplate, trigger guard, lock escutcheon, and ramrod thimble, from silver mounted flintlock rifle"). Also, it appears that the toe plate is not engraved - unlike the rest of the silver furniture (per the auction description). Finally, it is a very basic toeplate when compared to many of the elaborate North Carolina toeplates, particularly for a fancy gun.
5. The trigger guard has a fairly long handrail when compared to the bow of the guard. I wonder if this feature is connected to a particular region, school, or maker?
6. The buttplate is a bit hard to explain, as others have noted.