The case is eerily similar to that of Mr Hayez, a Belgian teenager who vanished without a trace while visiting Byron Bay on a backpacking trip around Australia.
Video shown on day three of the inquest into his disappearance revealed Theo Hayez in deep conversation with a Dutch backpacker while making a bizarre search on his phone.
Key information which could reveal if missing backpacker Theo Hayez was alone or not still remains inaccessible because Google has blocked the release of crucial search query data.