I think you will need to (re)start a character in order to be able to get it from the mission. Shouldn't be that hard once you're character is level 25 ;-)
I've got one in the vault though, but will get a spare one either way.
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Right I knew that or everyone would just redo the black garden mission lol. It cant be acquired again from that mission unless its the first play through for that character. Your prob one of the few to keep it just b/c of the limited space we had for a long time. I scrapped mine on all 3 characters a long time ago
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I didn't have that much problems with the limited vault space to be honest. I have a rather fixed set of gear for PvE and another one for PvP. I used to collect the Raid gear, but stopped doing that when I reached the vault limit. Just started dismantling stuff I hadn't used or didn't see a point in ever (really ever) using. Only my exotic collection remained untouched.