Okay, I sent Beckett an email, and this is the response:
Apparently they are real.
Quote: Yes, these are legit.
BGS sealed these to protect the authenticity. Once they are taken out of that case, we will no longer stand behind them. If you bought them, and wanted them added into card slabs, you would send the sealed case into us. We would open it, and inventory the pieces here for you.
Now as for two sellers selling the same piece, I cannot speak to that. Not sure if they each own one, or not.
Regards,
Dave Sliepka
Merchandise Manager
Beckett Media
4635 McEwen Rd.
Dallas, TX 75244
972-448-9182
F 972-991-8930
Apparently they are real.