The police might get involved if you a) file a report and b) have pretty good evidence that someone has your bike. This actually happened for a friend of mine. She found her stolen (custom) bike listed for sale on CL several states away, turned out it was at some university campus. She called the local officer with whom she had filed her report, they got on the phone with the police where her bike was, and the next week her bike was delivered back to her.
2014 Bobbin Bramble / Brooks B67
2008 Rodriguez Rainier Mirage / Terry Butterfly Tri Gel
2007 Dahon Speed Pro TT / Biologic Velvet