Ask him.
Did he ever contact her by phone at any time? If he did, can you research the phone number?I have. He thought she was who she said she was because he didn't think she'd lie about that. He gave me the awesome "why would she lie?" line when he was first confronted.
The names on the emails I received were completely different than the name she gave him. That's the first clue I had that she wrote the emails. Then I went on spokeo and searched all the emails and names and locations. Nothing.
If the location is residential it puts you at about where their house is. Then just look up the people in that area...They never spoke by phone but they both used their iphones to message each via gmail and meebo but not traditional texting. May I just say I hate my iphone now and cringe whenever I see him even playing bejeweled on his phone?
I did use the MAC address and was able to find the general area where she was located at the time the messages were sent but didn't know what to do with that information. That was how I realised the emails from her "husband" were fake because he claimed they lived in another state.
I hate that I fell into her trap by thinking I was talking to her spouse after I received the email from him. It makes me so angry that it was the creature from craigslist all along. I just want to blow her game out of the water.