Thanks for the threads on this. Every seller I asked told me their keys were genuine... I have doubts so it turns out that they are illegal keys.
Most have suspect that these keys are genuine but MSDN licenses which means
Bulk licenses.
Where do they come from, it remains a mystery.
Is it from a educational place or organization, no one knows.
If you want to play safe just get licenses which are from SLS and etc. Which cost about $100+.
These cheap licenses many have brought and it is working.
However if one day MS were to audit all the licenses than...
Yes MS does audit their licenses for corporate, home wise not known at the moment.
In the past what MS did for pirated keys is lock out the OS.