I recently bought a 12-40 f2.8 from a third party seller off Amazon. It is used, but seems to be in an excellent condition. I registered the lens online on the Olympus website, but I am not sure if the lens is covered under USA warranty or it is one of those grey market lens. Furthermore, I did purchase the extended warranty last week for the lens and am not sure if it is applicable - used lens bought from Amazon?? I did contact Olympus customer service and they said that there is no way for them to tell me if the lens is covered under US warranty or if the extended warranty will be applicable. I would think it would be very easy for Olympus to check based on the serial #... Thanks!