Examine the aircraft for the FAA registration number or any contact information. Also, on the front will be a metal plate as to the model. Phantom xxxxxx Lastly, if you are not familiar withe the Phantom, look on the side of the camera plate, there is a micro SD card in a slot. Pull the card and examine it on the computer, the owner may have placed a contact point there along with the footage from the aircraft flight.
Those would be starting points.