Hey,
Maybe i'm wrong but i know developers are watching the forum so maybe they left the key so it's a limited quest? Because i think they already know no one can get a key since a while. I mean i don't know what will be the use for that key, but maybe they did it on purpose so first the people who got the key will have a "premium access" then they will allow others to get the key. I'm saying it again but maybe i'm wrong i just find weird no one can get it since a long time (i got the key)