If he is exchanging however many he is advertising in the photo, I don’t think that is false advertising. If he doesn’t send the right amount, that would be technically false advertising. HOWEVER, his listings titles and description do not specify the number he is exchanging other than the listing photo like the one shown above. I think that these sellers are too lazy (imo) to type out the actual quantity they are selling or they haven’t set it up in the API if that’s what they are using. Also, this happens a lot with gift cards. For example, perhaps someone is selling a $50 for $40 but for the amount text field, they put $100, making it seem like there’s a 60% off. Just have to pay attention to the listing title, description, and the listing photo. I also think the seller is at fault for not being descriptive and specific enough.