Basically all you need to play using a second hand copy is:
Your FFXI account
Final Fantasy XI - Rise of the Zilart, Chains of Promathia, Treasures of Aht Urghan and Wings of the Goddess

The 2008 version contains all of these. I found it impossible to get a 2008 copy, so I went with 2007 and got WoTG separate. I did get a glance at an unopened copy of 2008 for 360 when I worked for a second hand store, but the guy selling it didn't like the price he was offered and I had customers to deal with, so I couldn't run after him and offer a better deal.

Abyssea and the other add ons, they don't require anything, if you've bought them then they're bound to your account and you don't need install disks or anything like that.It's just the original game and its 4 main expansions. I got all my extra stuff from my PC version.

As a person playing on the 360 with second hand copies I can confirm that they should work. Just make sure you buy one that works with your 360's region, my XBox 360 is PAL, so all those NTSC US copies that I was able to find, they probably wouldn't have worked.