are you allowed to sell those keys. if you are allowed? please provide us the proof that you are allowed to do so. If you are selling the keys from multi-user license, you are not allowed to do so and it is illegal. you have 24 hours to provide us the required info.
the keys could be unused but the point raised by desiibond is important. I also have a MSDN account issued through multi-user license purchased by my organization. I get keys for nearly all MS products but I cannot sell them legally.