If I see an ad with only pictures of one side I usually assume that there is something wrong with the other that they don't want to show. Granted that isn't always the case, but sometimes its better to be safe than sorry. If you found marks on both sides when the photos show only one side, but that one side is without marks I would think something isn't quite right. Might have to open a case. I always liked the dozen pics of the boxes like the box is the most important thing. Maybe to some it is.