I'm new to Canon (switching over from Nikon) and just purchased a 1dx on ebay that was advertised as USA/Canada warranty. When I received the camera the warranty card was a Canada warranty not USA/Canada. I contacted Canon and was told the Canada warranty card meant the camera was only covered in Canada. She could not tell me if there would be any difference in quality between a 1dx that comes with a USA warranty vs. a 1dx with a Canada only warranty? Are the 1dx camera's coming with a USA warranty any different than the international/canadian versions? Is there a way to use the serial number to research the camera I received like track it's history? Other than the inconvenience of shipping the camera to Canada for service, does it matter? Is Canon the same or is Canon USA better?