Yekan, did you get a premium account!??!
Back to this subject, I would recommend searching for your coffer behind the 2nd gate, I went and camped behind the 3rd gate for several hours (most of last night) with no show of the coffer. I went to the 2nd gate, waited for about 45 min for another party passing through and snuck in and found it right away.
Check my avatar, Win looks pretty happy with his new hat ^^