Just so you know, if you call the Canon service center in NJ, they will tell you that ANY transaction on ebay (even if it is from an authorized dealer) will not have a valid warranty. Canon will refuse to honor warranties on ebay transactions. I spoke to several people at NJ Service Center including some of the higher ups. They all said the same thing...if you bought it on ebay, no warranty. Despite my argument that ebay is just a sales platfrom only, they were not willing to change that stance.
So do contact the seller ahead of time, and verify that they will be willing to give you a receipt that does not mention ebay. I was successful in getting a couple of vendors to cooperate and issue receipts that did not mention ebay at all.
According to Canon's position, all those authorized dealers selling on ebay claiming warranty, are making false claims.