Far as I can recall the Buddy Pass that came with the Collector's Edition is supposed to be a second copy of the game. Those who bought the CE version essentially paid for two accounts. Even if the game is free right now (Only due to SE's mistakes) you still need an actual copy of the game, IE the registration code. Without it you're not gonna have access. At this point all SE's doing is making you pay for the software once, and then get free complete access to the game itself until they determine to pull the plug on this offer. Now, no offense when I say this, but if you're looking to just get someone's pass to see if you like the game, don't. Like I said it's a full copy of the game and you're pretty much wasting their key if you decide it's not worth it. Not to mention I doubt anyone wants to just give up a Buddy Pass like that without knowledge it's going to be used.
I've still got mine unused but may have plans to give it to a friend still, but only because I know they'll actually use it and won't up and quit later thus wasting it. Giving it away is pretty much like buying the game for someone in a sense...
FINAL FANTASY XIV Roleplayer
Sair Gammonari - Hyur Midlander Male - Conjurer (Somewhat retired.)
Mihana Zhralyia - Miqo'te Seeker of the Sun Female - Archer