Something similar happened to me - I had a car stolen (a block from the Fremont, CA police department, no less), and when it was found a month later it was full of stolen goods. I found bolt cutters, several garage door/gate openers, an LA sheriff gun holster, a gold ring, gloves, a car jack... lots of supplies that one would use to steal things with. And the police told me to keep it all and do whatever I wanted with it!
I recently dealt with a car theft and they took my jack. The dealer said >$600 for a new one (lol) so between that and the ring, you got quite the haul
It's $600 because they likely don't keep it in stock anywhere nearby, and they only had a few in existence. For those you're better off going to a junk yard and getting one from the same brand vehicle.