DonM
It's a known scam mechanism. I think you are talking about this one:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=29552&item=3775884468&rd=1&ssPageName=WDVW As you can see there were 12 bids higher than yours - and the reserve was never reached. There can be no legitimate reason why you specifically should be re-offered this keyboard....
http://offer.ebay.com/ws/eBayISAPI.dll?ViewBids&item=3775884468 Forward the email to spoof@ebay.com and they will investigate it for you.
Remember - some things CAN be just to good to be true.
Jerry