You can gain Puzzle Box of Yogg-Saron through Profession: Archaeology when you get to Archaeology 350.It needs much time working and good luck to get Puzzle Box of Yogg-Saron.
1.You will get Puzzle Box of Yogg-Saron.
2.You need to provide your account.
3.Your character needs to be lvl 50.
4.Estimated time: 1-3days.