Alienware Area 51 - Card Reader

After 2 1/2 months, my new system arrived missing a card reader.  Not a big deal - I will simply install one BUT ... Does anyone have any idea where the USB cable is?  I see that there are three on the main board that run up the side to the top, 2 I would assume are being used by the front USB connectors but I cannot see the third anywhere.  How do I get this connected?