THAT SUCKS... My 997 was stolen a while ago and it's a very sh!tty feeling! I doubt someone would post teh car for sale, but you may want to check craigslist and ebay for parts and accessories from your car for sale. That may be a good source for a lead.
The cops, (unfortunately, because of their workload with stolen cars), won't do anything unless the car falls in their lap. I called the detective assigned to my case several times for updates on the investigation and never got a call back.
Wish you the best of luck with this ordeal!