Benedict's Chest bugged

[Petroix]

Benedict's Chest http://db.vanillagaming.org/?object=3239 worked before (2 days ago) but yesterday and today i can't get http://wowwiki.wikia.com/Aged_Envelope from it, chest is empty. People around had the same problem, we tried to farm that key a few more times and wait a bit before opening the chest, but it didn't help. The letter inside gives 2 more quests, please fix it.