How do you get a list of all your Game Center accounts? I need to know what the original account was for my Clash of Clans is so I may transfer to another device. Any suggestions? I have tried multiple times trying to find through my emails with no luck. Can Game Center email a list of my CoC account?
The Gamecenter tokens are saved in your keychain.

Open it in search for it (Game). It will list all accounts you have.

com.apple.account.AppleID.appleid-token-gamecenter