That Ben guy called me also. From Vehicle research with national auto. He called me from a completely different number each time and when i told him I wont pay him anything unless my car was sold and that there are scams like that on craigslist and he hung up on me, got my answer that its a scam!
I had the same phone calls and"Ben" left 2 voice messages with exactly the same information - we have a used GMC listed on Craigslist - Said he was from Vehicle Research Dept. at National Auto - their web site is auto-market-now.com and he gave phone 800-566-7916. I don't want to get scammed again.