Ugh, so dealing with the same type of situation with an ebay purchase as well. I recently bought a harmonic balancer from ebay, for my 68. I thought I had found one that was actually correct with the timing line lining up with the Keyway, 3896966 (I had posted in a earlier post asking about the differences between the 67/68 and 69 balancers). I was pretty excited to get it as it would be the correct one for my period correct 350 I was going to put in my car. Well, the box arrived from the USPS empty, a big hole in the side like someone had ripped it open, and then wrapped all up in plastic. So I'm going through the steps as others had highlighted in this post to try and get my money back. Should be fairly straight forward, but gotta wait 3 days to file a claim and hear back from the buyer, go to the Post Office to show them the damage, yada yada. I really just want the part, since it was one in 30 on ebay I had found.
Anyway, I just needed to vent to someone who understood the frustration of losing something via an ebay purchase, and a part I was really looking forward to getting. Thanks