kinda usless but still..
if you do the achievment The Coin Master The Coin Master - Achievement - World of Warcraft
they will send you a Titanium Seal of Dalaran in the mail,
if you loot the Coin and not the mail you can relogg and there will be another Coin in your mailbox
soo
1.do the acievment
2.Loot the Coin and dont take the mail
3.logg out
4.logg in
5.Loot the Coin