Rather new to Nikon coming over from another brand and not quite familiar with all the details of their warranty. Please forgive me if this has been covered before. I just picked up a lens used that was purchased 6-24-08. While shuffling through the paperwork, I noticed the warranty card along with a 5 years of protection warranty paperwork. Does this paperwork need to be submitted within 10 days of the purchase date in order to obtain the added 4 year warranty? If so, does anybody know how strict the 10 days is? Am I out of luck?