Items do not delete on their own and unfortunately Bungie has a no return/refund policy on any deleted or infused items or characters.
https://www.bungie.net/en/Help/Article/12211
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Well, yes, items do not ideally delete on their own. However, there has to be a possibility that something is wrong in the workings somewhere, and items somehow get dropped. If you're just here to tell me "you must've done it yourself", then kindly GTFO. I don't want a refund, just to pass along my info in case it happens to others too. If I'm on here asking for a refund for some skeleton keys, I'm bad off. Lol
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Just saying if they did get dropped, it would most likely have been during an action you took, or someone else using your account took. Could have happened if you were transferring items via the companion app while loading into something in the game. Could be that you never went to orbit after your strikes before logging off. Otherwise keep an eye out for more reports.
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I lost a gun one time like that I got no help and you can't say I deleted it because it was replaced with an infinite loading symbol and a default black looking gun. Thanks for the help Bungie. Oh wait it doesn't exist unless it's an eververse problem...