Unfortunately no, if you've followed the steps provided to no luck, you most likely won't see your weapon returned to you. It may show up within a day or so of it going missing, but that's about it.
Bungie doesn't restore lost gear, I'm sorry.
https://www.bungie.net/7_I-accidentally-dismantled-an-item-I-wanted-to-keep/en/Help/Article/12211
English
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This was lost due to a bug according to this thread, so Bungie has a large obligation to restore it.
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The page, while doesn't specifically include every such circumstance, it's used to convey the point that bungie doesn't restore lost gear or characters.
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meh, to me that page conveys the idea that they won't bother to undo *player* carelessness. Bugs which players have no control over are a different matter, and I would very much hope Bungie treats bugs as such.
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Doesn't matter how the item gets lost. Bungie won't restore it.
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it has not been dismantled as i did not recive exotic shards from it and i find it stupied that bungie can provide a broken service to players
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This is a quote from the article "The choices you make in Destiny are often permanent. Please be careful when you perform any of the above actions."