Never owned a scandium gun of theirs, but mine have never had any blemishes are junk on it whether from the Performance Center or standard guns. If it wipes off, I wouldn't worry about it. If it doesn't, I'd consider calling S&W (perhaps send them the pictures) and see what they think of it. That "NIB" may have been fired some, banged up some, and then cleaned and left in a box somewhere for quite some time. Some look like stains, but a couple look like possible light damage.