Are you certain you discovered those in Destiny 2 and aren't thinking of Destiny?
English
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Thats a good point but yes I am sure I had got them in D2 and used them up until I stopped playing. Thorn for example was on one of my characters and it is no longer equipped and unavailable at kiosk.
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If it's not unlocked in your Collections the only option is to re-discover it at this time through the current source.