Matthew has been located safe and well.
He will now be medically assessed.
A land search is currently underway for a missing teen in Flint near the Mundaring State Forest.
Matthew, 17, was last seen about 10:30am on Tuesday, leaving his Pickering Brook address, in a vehicle, wearing a t-shirt, shorts and black thongs.
Police located the vehicle, abandoned, hours later, on Edison Mill Road near the intersection of Brookton Highway in Flint about 2pm.
Matthew is described as 175cm tall, with a medium build, light-skinned, green eyes, and brown hair.
The State Emergency Service is assisting with the search.