Where did you buy the device from? If it was from Google, you're fine. Just call them and they can look up your order based on your account. If it was from anywhere else, you'll need to follow-up with them.
Even if you lose the receipt go to checkout.Google.com. login with your Google account. There you will see a list of all your purchases you made with Google. Click on one of em to view a receipt. It keeps a record of every purchase.
Gaming is a part of life of almost every Android enthusiast. But many of new titles are … more
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