A couple of years ago my wife bike got stolen in the city. Police said we are probably not going to find it. Could not let it be. Set-up searches in all second-hand websites in Europe. From Sweden down to Spain and to the east like Polen. Got hunderds of hits, but after 4 months , I woke up and opened my search results first picture was my wife bike. Even had the local bike shop sticker still on it. Almost gave up.
Contacted police in Netherlands.....nothing they could do. So I tracked the guys location via his phone number he gave online to some-one else. Easy search brought me to his small village in Polen....Contact the local police station......did not speak English...so found a translater and they arranged a search and caught this guy with over 70 stolen bikes in garage

Eventually the Dutch and Police police rolled up a very large organization selling stolen bikes.
Eventually 5 months after finding the bike I got the OK from the Polish police to get my bike back. Made a short holiday out of it and pick up my bike. They were so surprised I was willing to drive 1100km there to pick up a bike Hahaha. And they were very ashamed this was my first experience with Poland. They gave as a tour of the region and explained a bit about the area. I thanked them and we drove back home
F*ck thieves and stay away from my bikes!