Use the fake e-mail to tell the scammer you don't know which listing is genuine. Say you made contact with the person who listed the other property. Really make it sound like you're concerned because they were telling you the craigs ad is fake. Then watch him either remove the ad and run or keep mounting the evidence on how his ad is real then hand it over to the FBI. Don't forget to ask for a viewing and have a meeting at the house or in the house. Camera footage of who shows up if anyone does is a plus.
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