Stolen GPS...think we found the thief

[hyper9e]

Two days ago I was at my high school ski practice when I came back to my car and discovered that the GPS was missing. It was clearly stolen along with my jeans. What really disturbs me is that I even hid it under the seat and the thief still managed to find it. It is a Garmin 255w so it is pretty expensive. We have reported it to ski area staff and checked craigslist every day. We had no luck until about an hour ago when I searched GPS on craigslist and found this ad.http://minneapolis.craigslist.org/da...572200560.html The thing is that the thief did not take the car mount but he did take the car charger which is in the pictures. He also obviously cut/paste the info and just wrote his phone number in. It is also located in the exact area in which it was stolen.

I don't know what to do because I can not prove that it is mine. Do you guys have any advise or ways I could prove its mine?