Scott Diver, 16, of Clydebank, was last seen on Saturday September 17 in the area of the town’s shopping centre and bus station.
Scott’s family have set up a Facebook page to appeal to the public for help in finding him, and in an emotional plea, said: “This will now be the 9th night scott has been away from home.
“He is not in any trouble, we just want him home safe. He is vulnerable and although approachable would be scared of a group of large people approaching him.
“Our only hope right now, as no sightings have been confirmed, is to keep sharing his face for the public to see and share and hopefully somebody notices him.
The statement ended: “If you see this Scotty please come home.”
Police say they have spoken to around 1000 people in three separate areas of Clydebank in a bid to find him.
Inspector John Mullen said: “I would like to thank everyone we spoke to for their co-operation. We are looking through all the details gathered during the operation and will follow up any information gained from this.
“Scott’s family are extremely distressed by his disappearance, I would again urge anyone who has any information on Scott’s whereabouts, or any information that may assist this enquiry to contact the team at Clydebank Police Office through 101.”