Here is the WhoIs info
https://www.whois.com/whois/hotclassicsales.com Not much info there but that's not really too uncommon. But the registration date was only about 20 days ago. 10/10/17 That's likely fly by night. They are probably harvesting info from other sites and placing adds on the site to get revenue and don't really care about selling cars. If you can determine where a car is available from check Craigs list for that area and see if the same car is listed or Carfax or Cargurus etc. In general if someone selling a car isn't willing to let you see the VIN then there might be a problems.