Sold a car online now buyer wants refund!

Sold a car on eBay had it for about a yr. In the listing I put all known damage that I know about. I also added a link for free from carfax with the history of the car. I added car is sold as is I had the buyer sign a bill of sale also saying sold as is. He drove down from ct to nj inspected the car signed and paid towed it back to ct. 3 days later I get a email I want my money back this car has much more damage then you listed its been in a accident and has electrical and frame damage. I explained in the yr I had the car I never had a accident and it was in okay shape. He is demanding I drive to ct pick up the car and refund car , gas and tolls. I went to DMV and the police station they told me I did everything correct. I contacted eBay and they told me I was not at fault. Now he is emailing saying he is going to sue me.