I'm copy/pasteing the same theary i had with the lazerblade and the key. ITS THE LAZERBLADE. Because when they moved area 51 the LAZERBLADE VAULT IS STILL THERE. If you press E it says you need a some sort of (KEY). I tried with the deathray key but it did not work. And the new badge must mean the silver key is STILL OUT THERE.
Not neccesarily cuz the lazerblade was a limited time weapon like the frost gun. as for the vault that was probably cuz when they moved area 51 they prob made it one unit and then moved it at once. as for my theory ithink its related to a new boss
What do you think?