(News from the Ether)
I have sent several damaged or defective lenses or cameras to Nikon over the years. This has meant an expensive postal exercise including insuring lenses for up to $2,000 and cameras for up to $5,000.
Now Nikon have changed the way this operates. They provide a free service where a courier comes to your door and delivers the lens to Nikon for repair. As well as being free, this is probably safer and more reliable. A great improvement from my perspective.