I've never heard of anyone in the USA having Canon Refuse a Warranty on items bought from BVI. The warranty card means nothing, Canon wants to see your purchase receipt to get service. Otherwise, they go by the date of manufacture which they can get from the serial number. That might mean you only have a few months of remaining warranty.
In the unlikely event that Canon will not honor the warranty, Big Value will cover you.
Be sure to use a Card like American Express to pay for the camera. They double the manufacturer's warranty up to one additional year. If Canon refuses to fix it, Amex will cover it.