Truly, that boat looks like a steal at that price. If I was on the west coast I would have jumped in the truck and knocked on their door already with cash in hand. I guess there is also the slight possibility it's some sort of CL scam, but it sure looks legit...
That said, to the original poster of this thread many/most folks on Craigslist don't put their phone numbers in their ads as the scammers will even call or text you. However if you send an email (with your phone number) through the Craigslist system the ad issuer will get the message and should get back to you. Still, if you are out of the country and your phone number is obviously overseas the seller may shy away but it doesn't hurt to try. Good luck.