I don't know if this'll help, but worth a try.
You can contact the operator, explaining the situation asking for help or at least give the owner of a phone number (IP address and the time you have). The room is already possible to define the passport details at least, to call, to write a letter to a specific person.
Quite utopian option to send a phishing email with the shit that sends SMS to short number or link to the web page and if you have enabled the transmission of GEO data, you can determine the location of the phone and teleport to this place to catch the owner.
To know on what terms Google provides advanced information about activity in your Inbox.