Remember two things:
No Shipping and Cash Only.
If the deal does not meet these two requirements, then don't go for it no matter how good it is.
Most probably, when you email this guy, he will say that he lives somewhere else and that he will ship it to you. If not, he might be a legit seller.
As for it being stolen:
Ask for the accessories that come with it. Box, disks, laptop bag, etc. Check if the magsafe is new or old. Phone the guy and ask for the serial number and check if it stolen.
I created a similar thread for a then current gen UB MBP 17 inch for $1200. Everyone here told me that it was stolen. But it wasn't. Sometimes, very good deals do land on Craigslist. But, In the end, only you can make a determination if the seller is legit or not.