Care to explain why you marked the game as received then?

I was giving away the key from Humble Choice, and those happened have activation deadline on December 22nd.
As per rules, you had a week from December 12th to activate the game (so until December 19th), and you marked it as received on December 17th or 18th if I recall correctly.

I have no valid key to give you, nor can I even reroll a winner at this point, since the key I have is useless.