Someone stole my CDs

This morning, I woke up to go to work and got in my car and noticed some things from my side armrest were on the passenger seat. I look inside and my CD case is gone. Not the face plate to the player or the player itself or anything else, just my case of burned cds and stuff made up of random mp3s. I don't know who did it, but I'm going to get them back. And I'm going to kill whoever did this. Slowly.