Given the substantial transformation that H2O2 restoration makes, I can see it would be to an ebay seller's advantage to use this technique prior for sale - and the would-be buyer would be completely unaware..... I'm not the type of person that would buy second-hand toys (too OCD), but I feel sorry for any collector who purchases a seriously expensive vintage toy only to have it yellow before their eyes within a few months/years. They might even blame themselves without knowing the UV damage had already been done.