Bungie does not replace lost or dismantled items or characters. For future reference, the Postmaster can only hold 20 items if that was the cause of your issue.
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I do not dismantled itemes and do not take it from postmaster !
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Yea after a certain amount of time post master storage will be deleted so don't use it as storage and remember to go and pick up lost items.
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The postmaster is not storage. Due to the limited space items in the post may be deleted. There is no way to get your lost items back.