I was involved in recovering some extremely famous movie props that had been stolen many years prior by a studio employee. The studio wanted to restore them and

I was involved in recovering some extremely famous movie props that had been stolen many years prior by a studio employee. The studio wanted to restore them and display them, and they are now on loan to a museum. We knew who had them because (almost) all the people that stole these kinds of pieces ended up not being able to keep it to themselves and would mention it one day on a forum etc. The studio's lawyers sent letters which they ignored. In the end someone realized that the guy lived very close to the writer of the movie in LA, so we called them and had them knock the on the guy's door. That worked.