Lex Jenkins , Dec 31, 2012; 03:05 p.m.
I noticed that 10 day deadline on the 10-30mm Nikon 1 kit zoom as well. It may have been there on my other Nikkors but I never noticed and never needed any warranty work either. I suppose I'll go ahead and mail the lens warranty. Seems like a hassle when Nikon USA doesn't require any similar mail-in registration for Nikon USA camera bodies to be eligible for warranty service.
It's also a bit of a catch for folks who buy from vendors that allow a return or exchange period longer than 10 days, but stipulate the warranty cards cannot have been filled out by the purchaser.