BillB- looking at the first key (Lafayette/Washington) it definitely appears to be cast, but finding any obvious ‘left-over’ signs on it would probably be difficult even if studied in your hand.
Bear in mind that the maker would have spent a lot of time ‘cleaning up’ and fitting the key after casting- filing and scraping any raised seams, flashing and imperfections before final degrees of finer finishing and polishing. When you then add x amount of years heavy use, wear, plus 200+ years of handling since, the chances of any obvious signs are probably a million to one.
Can only suggest (optimistically) looking for any possible signs of straight recessed marks or for any signs of porosity around the point where the bit projects from the pin, this would be the number one place for any bubbles to form where the flow is greatly affected during casting. Also any potential points in the bit that were cut after casting, as this can reveal porous pockets within the casting underneath, but these are also unlikely on a well made example and even if present would almost definitely have been removed as part of the above processes when made.
Overall the key looks very well made and it’s probably unlikely to give away any obvious clues.
