Are you buying from Walmart in the store or through their Walmart Marketplace online? The reason I ask is their marketplace appear to me to operate similar to Amazon Marketplace where the actual seller sells through Walmart but the item is not sold by Walmart.
If as Rick says, the party listed as the "sold and shipped by" party is not on the list as an authorized seller, then it may be a gray market item.
Be aware that some Canon Factory Authorized Dealers do sell grey market gear right along side Canon USA factory backed warrranty gear. But, they tell yo about it up front.
Grey market items have a “guarantee” from the retailer, which is not exactly the same as a warranty. In my experience, a guarantee means refund or replace. Warranty usually means they perform repairs, too.
