Well....the listing DOES show a particular person with good FB winning the item...my first thought was to say maybe they don't know enough to click on 'other' in payment section to send a check, but they've been around ebay long enough to know that
Did you get the email from the same buyer? It's hardly an item (or price for that matter) that a scammer would go after but Express or not, I would STILL think it should show in your sold items. Keep in mind, I know nothing about ebay express...
I hate to say this, but if it were me I would contact 'live help'. Depending on the person you get, sometimes they're a LITTLE helpful
Or just look here to find out about Ebay Express (tho I still dont like the fact it doesn't show as 'sold'):
http://pages.ebay.com/help/sell/ebay-express.htmlPay particular attn to the 'transaction and payment' section...it says your payment preferences will remain the same....