Search ongoing for missing 13-year-old boy after over a month

year-old James Yoblonski has been missing for over a month after leaving home in a family car.
He is believed to be trying to live "off the grid" in a Wisconsin state park based on interest in survival skills.
Possible campsite and belongings found but no definitive signs located during search efforts.
Father is offering a $10,000 reward for his safe return.
Authorities continue to ask for any information from the public that may help locate the boy.