Some decades ago, my dad's best friend's car got stolen in Geneva. They found it a few days later 50km away in France. The police returned the car to him and said it was used in a jewelry store robbery in Geneva. Not sure how or why, but they returned it to him with its contents it was found with; two Mont Blanc pens (worth 700$ each) and a few high quality tools that were probably used to break into the car. We got a fancy pen in the family since...
On the topic of car theft, my dad used to have a BMW E30 325iX back in the days. The car was very sought after by thieves, so his cousin (who's a mechanic) installed a switch under the seat to cut-off the gas between the tank and the engine. The car was broken into a few times but never disappeared.