It's very difficult. With the mass availability to public access that is a wireless, even the couple of ways you can try to narrow someone down still leaves only a general idea of who someone might be. It used to be some guys could bounce off serves and keep the IP addresses all mixed up. Any more the service provider may do this just to keep up with network demands.
I have also sent a message to Tony on another forum. If he did do this, I would hope he comes forward.