When I was selling a large collection I purchased in the winter of 2014-2015 I consigned a number of vintage cards (around 200 or so) with PWCC and overall was very happy with the results. I did not keep track of all of the cards that I sold through them after I sold them, but there was one of mine that did pop up on a couple of different occasions.
Mine sold in May of 2015 for $283 Here is the link
https://www.pwccauctions.com/item.php?item_no=1110706
The exact same card sold again in July for $360...I remember wishing I would have gotten $360 for my sale....so I don't know if someone did not pay for it or what...but alas same card
https://www.pwccauctions.com/item.php?item_no=1147491
Then this exact same card sold yet again in September of 2015...this time for $290
https://www.pwccauctions.com/item.php?item_no=1155809
They did dress up the description a bit from when I was the owner in the later two sales...but no clue who sold it the next 2 times in the following months. My suspicion is someone did not pay for it at least one time, but that would be odd to happen twice in back to back sales.