Posted By:
DavidPerceptions are important. Knowing what you sell and that most of it is SCD encapsulated, I would simply change the wording (not the policy, which is both a reonsable return policy and implicity guarantee of authenticity) to a less Draconian-sounding 'Will accept returns if there is a material problem.' The idea is to give confidence to the potential bidder who does not know you and is wondering if it is safe to bid.
Again, unduly restrictive or unresonable policies (ala, not allowing for return even if it is fake) hurts only one person-- the seller.