The Missouri State Highway Patrol has issued an endangered person advisory for a 7-year-old boy who was last seen on Dec. 2. Investigators say 32-year old Anthony Davis was supposed to return his son, Seth Davis, on Dec. 4, but never showed up for the custody exchange. They were last seen at 6 p.m. at Walmart in Chillicothie. Investigators have pinged his cell phone in the Washington, Missouri area on Dec. 6 and 7. Anthony Davis has a mental health issue and may be off his medication. Davis drives a dark red 1998 Dodge Durango with Missouri license plate SM4G3N. If you have information call 911 or the Gallatin Police Department at 660-663-9512.