They might be Microsoft TechNet subscription keys, but MS has really cut down on the amount of keys a sub buys you now in order to avoid scammers doing exactly this.
I signed up to TechNet about two years ago and for $150/year I received ten keys for pretty much every recent version of Windows, which is admittedly an excessive amount but an insane deal. They have since cut it down to two keys per version with some editions sharing keys. Kinda lame they did so but it's understandable why, and still a pretty good deal.