stolen 86 Trek 560

i have repossessed a long ago stolen bike. it's a really drawn out thing, as a sketchy "friend" of a friend had this bike a year or a little more ago, i was consulted around that time for help with the situation, but it took until a week ago for me to get ahold of the bike. it has just been posted to craigslist a second time today. i want to get it back to it's rightful owner.