Unfortunately, if the item was pushed out of the Postmaster, it's gone for good. The Postmaster should not be used as a secondary form of Vault space. Bungie doesn't restore lost or deleted items. https://www.bungie.net/7_Deleted-Item-and-Character-Policy/en/Help/Article/12211
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Well, im guessing i got that item from Variks's quest. Is it possible to restore the quest.
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Quests cannot be reset. This sounds like you had the weapon, Does not Bow. You can receive this from the strike, The Shadow Thief.