If for some reason you don't want to return it and have them give you another one (which I'd probably do unless you'd have to wait 3 months for another new one), you might consider a skin for the reader to cover the scratch.
DecalGirl has a nice selection, they go on pretty easily, no bubbles at all, and when removed leave no residue. I have one on my 350 and love it (the Milky Way design).