With Bungie you never know if it's actually a key to a Easter egg.
The Stranger hands it to you. This could be Bungie's way of saying this is important for other things.
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Edited by Yb91xTitan1x: 8/4/2015 11:43:30 AMEhh. With the limited vault space, all 3 of mine have long since departed. I kept one of them for a long time.... But after 9 months and no word of them ever doing anything with it, I deleted the last one. No reason to keep around a 200 or so level weapon.