I get this identically worded msg from a new "user" once a week. That alone screams "scam." But it also makes no sense. I haven't offered "[my] sports cards for sale," and the wording-- "still have your cards ..." --weirdly implies that either something happened to my cards in particular or now I am selling someone else's... Doesn't sound like a native English speaker, frankly. Maybe it is one of those people offering to take my graduate school exams for me?