You do not get more than one product key for any product, it doesn't matter if the software is a game, Adobe or Microsoft software, when you pay extra for multiple installs of the same software you use the same product key each time, activate the software online and once you have installed and activated the software online the permitted amount of times you will get online confirmation and not be able to register the software on any more computer.Yes it is from before. I have 3 license keys that came with it.. and yes it's an official copy.
You only get one licence key with Windows OEM/System Builders and they can only be used the once, if you use the same key on another computer it will either not let you activate Windows from the outset or at some point it will tell you that you are using unlicensed software (this message stays on your Windows screen) and you will not be able to update Windows which puts you at risk of malware attack.
Aware of that as I checked but as asked have you actually been able to find one, PCPartPickers checks many merchants for available components and in the case of the US they check the likes of Amazon, Newegg and PC Outlet to name just three and not one of them has a suitable board, you can check yourself here970/990 boards work with the CPU. Like ASRock and fatality boards.