What is the use of OEM keys?
It is completely legitimate key. You get full support from Microsoft, unlike the holders of MSDN keys that are illegal for home use
If you say that our keys are illegal, can you prove the source of your keys?
Yes, you can write to support and clarify the legality of this keys
Nice vague "proof" - they need to send you the coins FIRST to get the product number to contact support and find out they've been scammed. It's no wonder you created a new account to do these illegal sales of keys.
https://bitify.com/auctions/computer-software/windows-10-professional-oem-coa-scan-234344/ - Use Escrow! What more proof do you I have to provide?
I do not understand people who snapped up with unfounded accusations!