Doesn't seem legit to me. At all. Does he say where he is located, or leave that out? I've found that especially if they don't list a local city/town within your area on the ad, they are almost ALWAYS scammers.
I think its too good to be true. Try to deal w/ in person and cash only. Also consider if it is true it might be a little on the warm side. So proceed with extreme caution.
Josh