The seller is the only one that can possibly assure that the product is without defect. The buyer can request pictures, request they take a look, etc. but they are ultimately at the mercy of the seller. The vast majority of knives we, as enthusiasts buy, we are trusting the seller to send us the right product in good condition and the seller is, rightly, where we turn to correct it if that isn't the case. If the seller hasn't bothered to make sure the product is in proper order, I simply don't see how the buyer should be held responsible.