If it's not in the collections you don't own it and never have it on the account, you probably got it on another account, and if you mean D1 that doesn't count, the D1 version is not transferred to D2
Edit:
Dungeon report shows you were in the old Zero Hour mission but never completed it
English
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I never played D1 and i know i had the weapon but i suppose there is no way for me to prove it so theres nothing i can do. i was just asking if this kind of thing has happened to anyone else. Zero hour i definitely completed with an old clan. is there anyway to get it again, i dont mind grinding for it?
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The mission returns next week with a craftable version of the outbreak
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May 14* We have 2 more weekly resets of Whisper, unless Bungie have changed the release date?