Have two Win 7 Pro keys, used one and upgraded to 10. Dont know which one was used for upgrade.

[MitchelParsons]

As the subject says, I have two keys for win 7 pro. Is there any way to see which of these two keys was used to upgrade to 10? Everywhere I have searched says that the old key is no longer a key. Is there anyway to see which of these two keys is still a valid windows 7 key?Im building another computer and dont know which of my original two keys was used on my first computer, and dont know how to look up the 7 product key after a 10 upgrade. I want to use the other key for the new machine.

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