It appears as if the EBay seller us_caine is already known here, but I thought I would pass along a warning about the following auction:
https://m.ebay.com/itm/1963-Fleer-Ke...wAAOSwdjRaytEd
Boyer was one of the last 4 I need for my autographed 1963 fleer set. I took a chance on this exact card last summer. After receiving it, I sent it to PSA for authentication and it came back "likely not authentic." I asked the seller for a return and refund, which he granted. I didn't drop a negative feedback, because I figured it could be an honest mistake.
Since I still need 3 to complete the signed set, I keep my eye on EBay. I was surprised to see this card pop up again. I did some research and discovered the us_caine's history. I reported it to EBay as not authentic two days ago, but it is still active as of today.
So, if anyone is actually looking at this auction, caveat emptor.