I did not receive a product key

I purchased the 2G/32G with windows 10 from amazon but I did not get an activation key. In the documents they show a card that was supposed to be in there with it but I didn't get on. The box says on the outside "LattePanda 2G/32GB with Win10 product key" but there is not key inside. I can't seem to find anyway to contact the company and Amazon just says they deliver whatever they got from DFRobot. Now I am completely stuck. Does anyone know what to do ? Any help would be greatly appreciated.