Do you have to use the same username as your SS1 account to cash in your old account?
I cashed in my account, and the message when I try to do it again is You already cashed in an account. This makes me think you can cash in any SSL1 account, but you can only cash in one account.
if you had shell shock live1 account you can use the button on you old account that says cash in then copy and past it into the SSL2 button on shell shock live 2 and your coins will be on your SSL2 account