I got a Key, can you do 6 TF2 keys? This being my first trade I would be willing to go first to let you verify the key.
I got the key as well. After 5mins i decided to redeem the game for me self, it got revoked, "Duplicate Code". So be sure to refund the guy if he buys it.
Duplicate does not mean it has been revoked, duplicate means exactly that: it was a duplicate.
The server was under heavy load at the time the game was free and gave out the same key to multiple people.
As I said, I am willing to go first (when trading with a reputable trader) to let them verify the key!
There was a message on the page that they did not take any action and said they will post a full update later.
As far as I can tell, they did not yet. Meaning: yes they might very well revoke the key (tough luck) or they might not (cheap apocalypse edition).
Sure it is a "gamble" of sorts.
I would activate the key myself, but in being in Germany I can't without using a VPN (which I won't do).
I'm offering 5 TF2 keys for a key, post here and add me to discuss.