[Lunaryn]

Unfortunately, you can't add the free trials together. You get thirty free days at the beginning of any new account. That means if you discard/deactivate your starter pack account and create a new one with the Vana'diel Collection codes, you'll get a new trial, but you'll be starting over from scratch. If you want to keep using the same account, you can't get the the trial over again. Although some might choose to keep the starter account and make a new one, for the sake of later two-boxing. Whether that's worth the cost of eventually paying two full subscription fees per month is up to you to decide.

Also, the question isn't whether the expansions are there to install (though it's good to know they are, for those of us who have lost media), but whether there is an activation code to cover that content. The documentation with the disc should say something about this, but ultimately, the sure way to tell is to register the content, including the "expanded services" registration or whatever it was, and then see if the expansion names are lit up on the FFXI Log In screen.