User blog comment:Cosmicsilver/Dark Souls II Beta/@comment-5974459-20131010191325

I got one too, it was one of the extra keys for the Beta, they sent more than 5.000 keys, but the extra keys are disabled after the 5.000th player redeemed his/her key. We're so unlucky Cosmic-kun~.

PS: They keys were being sent to random people on PSN, nothing related to a previous sign up or being a DaS I player.