If you did not place an order or request for those games you are under no obligation to pay for them, nor are you obligated to send them back.
And sure enough, google finds the answer...
Tip # 10. If you ever get something that you didn't order (and it is not from your negative option or club plan) you can keep it without paying for it. According to the FTC, it's your legal right.
http://www.dmaconsumers.org/knowledgeyourpartner.html