This article says that prosecutors have traced the phone CB used. The handset pings the mast at the same time as the SIM. IIRC one of the early documentaries on CB also featured an image of a mobile phone in an evidence bag.
Phone call by Christian B 'made from outside resort where she was snatched'
You think it likely the documentary producers got access to the evidence room to photograph the phone?
My guess is that will be a stock image