Item #31805 (possibly named "Monster Dagger Outland Raid D04 Green") doesn't exist. It may have been removed from the game.
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Monster - Dagger, Outland Raid D04, Green - Live
Monster - Dagger, Outland Raid D04, Green - PTR
Monster - Dagger, Outland Raid D04, Green - PTR 2
Monster - Dagger, Outland Raid D04, Green - Beta
Monster - Dagger, Outland Raid D04, Green - Burning Crusade
Monster - Dagger, Outland Raid D04, Green - Wrath of the Lich King
Monster - Dagger, Outland Raid D04, Green - Cataclysm