No offense mr tumble but I think you are getting too involved.
I'm sure alex is in the right, but to be honest WE JUST DONT KNOW, do we? There are two sides to every story he might have had (what he feels) is a genuine reason for doing what he did.
How do you know, for example, that alex didnt con him? That HE might be the one who has been ripped off (I'm not suggesting that you did alex matey, just pointing out that we dont know) OR it might be a simple misunderstanding.
The point is, only those involved know whats really going on. You being a vigilante and trying to track down his address is going too far. Alex already knows his address and is dealing with it through the proper channels.