Questions about Golden Keys on Borderlands 2?
Ok, so I bought the Game of The Year Edition of Borderlands 2. I had a few characters built already and of course started a new one with the new dlc Characters. Every character I started or had and loaded got the Vault Hunter's Relic, Contraband Skyrocket Grenades, a set of Gearbox Guns, and a golden key. It also came with a prompt about the Natural Selection Annex being available.
My questions are...
1) Does every Character get their own Golden Key? (for example, I have an Assassin, Commando, and Psycho, if I open the Gold Chest with my Golden Key with my Assassin will my Psycho and Commando still have their respective golden key or is that one key for all characters on that profile?)
2) How do I get more Gold Keys? I meet people online and I've heard from 6 keys all the way up to 43 gold keys... How do I obtain more?
3) If I have two players in the game, do I need two gold keys to open the chest? For example, If my girlfriend and I each have a key, can we open the chest now at level 50 with one of our keys and then again at like 65 with the other person's key or does every player present have to provide a key?