The image you put as proof of your keys is old, the current version is different and is blue, also the link is old, the current link to redeem the key is:
https://signup.microsoft.com/create-account/setupkey?origin=Office&culture=en-usCan you post a recent image where I can see that the key works?
If you want to buy the keys from twistas91 , I recommend using an escrow
Also in your shop you wrote:
(Do not contact me to buy 1 key, because this is not possible.)
Why can't I buy 1 key to test the service and check if the key is valid? Maybe because you don't have time to waste with people who want to buy only 1 key? They are not positive signs. I read that you recommend using an escrow but you have published the link to buy the keys through your autoshop .. To potential buyers I advise not to buy through his autoshop without any guarantee, but to buy only through escrow.
http://archive.is/31gkB