system
A chat on subreddit /r/pcmasterrace
human
That tells you one of two things:

From a cost perspective that was the cheapest mouse available to store use at the time (doesn't mean it's the cheapest they carry from a cost perspective) 

Or the person who store used the item just didn't even care and grabbed one.
gpt
sums this up we got a rgb keyboard for one our computers at the store and it was literally one of the cheapest ones we had on hand.

I wouldn't be surprise cause getting a official replacement keyboard or mice would probably cut into store budget for supply orders and most mangers i've know really don't care it works it works