That's probably because its a scam to get you to pay and don't send you anything thus ripping you off. They only have one post which is a huge red flag to me first off. They pull this crap all the time on another Mustang car site I view all the time.
Agreed. That's a scammer and I've banned the account.
Good instincts Jason to google the email address first to check. It's become a common scam to post something like:
"my friend has *insert part name here* and you can reach him at *insert scammer email here*"
Luckily CS.com hasn't been hit too hard with these, but lots of bigger forums have.
Always be suspicious of a brand new member with only 1 post. I suggest simply ignoring those types of posts (and reporting them so I can check IP addresses and ban them) But if you really want to pursue it, at least get the seller to email you proof they have the part, like a photo of the part with your username on a post-it or something similar. Think "proof of life" in a kidnapping movie!