[zfk55]

There's virtually never a way to now if a bayonet stamped with the rifle's serial number is factually the original issued to that rifle. If a rifle was armory refurbished and anything was wrong with the bayonet, or if a soldier's bayonet was damaged, a new bayonet was issued and re-stamped with that rifle's serial number.
When there's a guarantee of a rifle and bayonet ussued as being both original to each other, there's not a factual way to prove it.