To be honest, call 800-922-0204 (C.S.) and tell them about the listing on Craigslist, they can have a tech look at the HEX number you have and they can see if its on the lost/stolen list. At that point, there's good reason for this to go to the next step because someone is dealing with stolen goods and selling them on Craigslist. And, a stolen phone will not be able to be activated either.
I am no longer an employee of VZW, I left on good terms and still think VZW is the best network in the U.S. and most helpful CSR's in any industry.
God Bless our U.S. Military.