I'd read the rules on selling hemets and edit your post if I were you.
If you are selling helmets:
No helmet can be declared as any of: NoS, never worn, unused even if boxed.
You must show clear photos of the shell to demonstrate it has never been in an accident and cannot offer for sale any helmet with signs of damage.
You must show clear photos of the straps and rear tightening mechanism as this is the best indication that it is authentic.
If anyone breaks the above new rules then you may be banned.