I have seen some REAL BEAUTIES (NSX's) off and on on eBay, Autotrader, Cars dot com, etc. for in the $5k to $10k over the year....
Then again, those cars usually require some type of electronic cash transfer, deposit, to some location in some foreign country.
Several years ago, I contacted an owner (legit) who had his car listed on eBay, but the same pictures of his car were also advertised online someplace else.... at the same time crazy scammers.
An NSX for $4,500 would have to be in tiny peices (IMO), from what I have seen.