Here's another good read on grey market items:

http://www.bhphotovideo.com/find/HelpCenter/USGrey.jsp

B&H lables most of their Canon grey market items as "Imported." While the items are not eligible for Canon's warranty, B&H warranties the items instead.

From B&H:

What kind of warranty is available?
For IMP items only, B&H provides a warranty identical to the provisions and limitations of the manufacturer's warranty for such items, with the exception of the time period, which is equal to the term of the manufacturer's warranty or one (1) year, whichever is less.* Your dated B&H sales receipt is all you need to obtain warranty coverage from B&H for a "grey market" product purchased from us.