Someone sold me a stolen iPhone, should I report him?

[Greg]

When I met him off craigslist, I verified the ESN immediately with Verizon - it was all good. But 4 days later when I tried to activate it, they told me that the iphone had been reported lost or stolen. So I've been trying to call this guy but obviously he doesn't respond. I have his phone number, few text messages and his email address. I even know his facebook profile because when I searched with his email/phone, it showed up.

So should I tell him that I'll report him to cops to get my money back or just report him to the cops? Is it in any way going to help get my money back?

Any help will be appreciated. Thanks