How do i ask an ebay seller to tag his photos for me?

You know how the seller on ebay should always have a picture of the items. Well all the good ebay sellers know that in the picture, they should have a piece of paper with their username on it so we know that they're legit, otherwise they can't be trusted with actually having the item. How do i ask for tagged pics without having to go into detail? Half the sellers don't even know what "tagged pics" are so they get confused when i ask them.