The badge grommet looks typical of the era to me.
Also, remember the seller may have honestly assumed every screw and rod was original - not all vintage drum sellers are vintage drum experts.
I don't remember offhand about the actual rod length 2" maybe? but your drum has the interior backing plates for the lug casings so that's a plus and definitely a 1960s brass shell. How many lugs 8 or 10? Did he include the Slingerland wireset? It should have end tabs with ridge bumps.
sorry, you can't play that card as a seller. if you state 100% original - it has to be. if you are not sure - say so.