I would call them and leave a message, email them and text them that they have 24 hours to contact you or you are going to post a thread on the BOI at Fauna and go to the authorities. Once that 24 hours has elapsed, I would contact the local police department and explain what happened and post a BOI thread. I wouldn't expect the police to do anything, but you never know. If it goes that far, I would also post a thread here since this is the forum where you met the person.