I list on Craigslist all the time and no matter how small the item, the scammers always hit me, I can tell by the first line if they are legit or not and just report them as spam so I don't get anymore messages from them.
I love the ones that say they want my item but they are on a trip and can't get it just now so a friend will be handling the sale and so on and so forth.
Once you know you are being scammed, don't reply, it's tempting to, i want to call them jerks, but continued response can set you up for other problems, you don't want them to have ANY information about you.