Basically, their friend quit FFXI and they took over the account. When the security tokens came out they created a SE account. They linked their FFXI account and the friend's FFXI account they took over to the same SE account and added a security token. The friend now wants to come back to FFXI and they are trying to figure out what to do. They are asking two questions:

1. Do you lose access to your Mog Satchel if you remove your security token?

No. All existing characters with a Mog Satchel will still have access to it and it can continue to be expanded up to 80 spaces after you remove the security token

2. Can you add a second security token to an SE account and use one token on one FFXI account and the other token on the other FFXI account?

I don't know, but i would guess at no.