Here is a Cinveralla Story. It can happen......
While building my 6, I was very patient. I followed Barnstormers & Ebay. One day about 2:00 pm, I was on Ebay and saw this Ad: Two zero timed O360A1A's for sale, all accessories. New Millenum Cyls and Lasar Ignitions. "If you get here in the next two days with a certified check for $23,000.00, you can have both".
I called the guy and he was needing money for his business, better than that he worked for FAA. I called the engine shop that overhauled the engines and chatted with them for a few minutes, the engines were real and certified, all logs. I threw a few clothes in a bag, walked out the door within 30 minutes.
My wife ask me where I was going "I said the bank". She ask where are you going after that? My reply was "Alabama". I got there the next morning, helped he and his AP remove the engines from his Travel Air, was back by that night.
I ended up selling the second engine for about $17k, people were fighting over it. Both engines are now in flying airplanes and haven't missed a beat.
Caution: For each story you hear like this, 100 more are nightmares. I'm not bragging about this, I just got extremely lucky, but it does happen. You just have to be ready to take action, check it out carefully and be patient.
I also bought a Brand New dual AHRS GRT Horizon I & EIS on Ebay for $7k, all was still in the original packing, all warranties in place.
Never hurts to look & be aware, but you always need to check it out and ACT FAST.