How to track stolen iPad

So, last night I was scammed by somebody on craigslist. We talked for a while about my iPad and then he asked for a receipt of some sort. When I went inside and wrote him a receipt he was waiting in his car. We traded money for iPad, but when I went to check the bills he sped off. They were fake. I called the cops and they have the serial number, but I feel like I can be doing something to find this guy. I called Apple and they basically said they can't do anything. Does anyone have any advice?