check windows 8 key availbilty in Vamt 3.0

I was trying to check if the keys that they gave in youtube which they say can use to activate windows 8 pro rtm is real, so I check using vamt 3.0. All of them are windows 8 pro keys but they say its retail and how it is retail, windows 8 did not even released yet, also the remaining activation count says it "not available". What "not available" mean I don't understand?