Posted By:
Frank WakefieldTime is CRITICAL, as mentioned above.
Save copies, not links, of where he purchased the card trimmed, plus your auction.
Tell the seller that you have saved those copies, and that you are returning the purchase, with delivery confirmation, at the post office 3pm Monday, unless he refunds prior to then. I doubt he'll refund, then you'd have both the money and the card. But he might to avoid the hassle.