I got my Arena Grand Master trinket in 6 hours the first night. First time around I got 3 chests, 3 hours later 6 more, and then 3 more chests 3 hours after that. You read that right, 6 arena chests in a row. All i had to do was get party invites from my guildmates, and chests were just spawning in front of me.
I dont know what the layering situation was on Realm 3, but its awful. This cant happen on release. Please find a solution.