I've got a brand new GENUINE OEM Silverguard Car Cover for your boxster. This cover is brand new and is still in the box. It includes the instruction sheet and a lock. I bought it for my car but never used it because I had my car for less than a year.
You can see it on ebay @
http://cgi.ebay.com/ebaymotors/Porsche-Car-Cover-OEM-FACTORY-for-986-Boxster_W0QQitemZ180141379072QQihZ008QQcategoryZ67 55QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
It is item # 180141379072 in case the link doesn't work.
email me at
cerebus221@hotmail.com with any questions or if you need additional pictures.
Doug