The Macomb Daily reports the teen had vanished Friday after appearing in juvenile court in Mount Clemens on a probation violation.
Sheriff's deputies searched for about an hour until a security officer became suspicious when he saw a picture that had fallen to the ground outside judge's car.
A deputy checked the car and found the boy in the trunk.
Macomb County Circuit Judge Peter Maceroni says the teen likely used a button inside the unlocked car to open the trunk.
The judge says that from now on he will lock the car when he's at the courthouse.
CLICK HERE to follow Action News on Twitter
CLICK HERE to get Action News on your website
CLICK HERE to find Action News on Facebook
