Swapping a vin tag is not legal. Either way ethic's are laking, they broke the law and swapped the tag or have concocted a story to to pass off a fake!!
There are ads here as well as on Team Camaro,
www.camaros.net/classifieds and of course ebay and also
www.traderonline.com has a large classic car area... Like Rita I found my '69 in my own neighborhood. I had driven and flown all over and ended up buying a car less than 3 miles from home... Patience, research and restraint will land you that dream car.