I have been trying to add cards to my card registry sets but a handful of cards won't work, I get an error message they don't exist but I have them right in front of me and they do and the numbers are legit. You used to be able to email SGC at
info@sgccardregistry.com and the guys were always great about manually adding them for me when I couldn't do on their site but that email no longer works.
Thanks,
tbob