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 you are selling helmets:
https://www.lfgss.com/conversations/143848/#comment6571218
Edited
@BirdBrain started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
https://www.lfgss.com/conversations/143848/#comment6571218