I know you are pissed, but don't do anything to the guy. If something should happen to him, the police will be coming to your house looking for you.

How serious are the police taking this case? There was some serious felonies committed here. As has already been asked, did the police take fingerprints? Were detectives assigned to the case? Did the police interview your suspect?

You can't even be sure the same guy that was in your home is the same guy who sold the bike on the internet.

How did he get into your truck without an alarm going off?

Consider some security precautions for your garage door. Attached garages are common points of entry in home invasions.

Let the police handle it for the time being. Stay in contact with them.