Total loss of credibility on the seller's part. Could be a typo... but it could also just be b.s... either way, I wouldn't give that dude 10 bucks for that car after seeing that he screwed up the ad in the first place.
I wouldn't send them ANYTHING. lol. It's just annoying to have to sort through all the spam to get to the REAL ads, then have to sort through the ones from people who actually know what they are selling and aren't trying to rip you off.