First off, I am curious how could you know that the files were copied from source code and ripped, and not purchased here? I mean one could purchase the template for himself, or for a client, or for someone else, there is no way of knowing whether it was purchased or ripped since we, as authors, have very little info about the purchasers and their websites / domains whee the template is allowed to be used, etc.
Secondly, like someone suggested, add code to next templates, that is the only way i can think off. use a stat counter (even a free one), and place it somewhere in the header where it’s less visible. Keep track with stats, if you see hits from a certain domain other than envato’s demo—there you go.
For now, what you can do is:
- email the website owner where your template is displayed, ask to prove their have purchased your files, else you will proceed with legal action.
- if there is no response, email their hosting service, say they use stolen content, most hosting companies will take the site down or at least suspend it for a while, which will be a good alert for the user.
I had my stuff ripped soooo many times and I can tell you one thing—there is no real force that you can use here. If they have no shame and steal, they will have no shame when you will tell them about it.
You will be on a winning side however, if the ripper is US resident, because there is a law that protects intellectual property, regardless it being digital or physical, so a small legal notice or a letter to a host will do the trick. but if he / she is somewhere else…. Just recently I had my blog content fully stolen, the guy is from Macedonia and there is nothing on this planet I can do, this is what my attorney concluded.
Anyway, good luck and hope you will get it resolved!