Craigs List if full of scammers, so you have to be careful. But reading that ad nothing seems to jump out at me that would say "steer clear".
He has pictures, gives a phone number and asks to meet in person. Seems legit to me. If you contact him, ask for the original Best Buy receipt... then you know it's not stolen.
You should contact the guy if that's the camera you're looking for at the price you want.