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2. The warranty ONLY applies to the first owner. If you buy a camera with US warranty used on these forums, as the second owner you will NOT be covered under the warranty even though the camera was originally purchased new from an authorized US reseller.
Interesting. Technically, Nikon says the same thing, i.e., US warranty only is available to the original owner and is not transferable. But based on what I have read/heard, and based on my own one-time personal experience, if you provide the original receipt from an authorized retailer, Nikon will likely honor the warranty regardless of whose name appears on the receipt. YMMV.