Recovering Microsoft Office 2013

I have a Lenovo T430 ThinkPad Business Laptop and I am donating it. It has Microsoft Office 2013 installed, I don't know if it came on the laptop or if it was installed after the fact, regardless I do not have the product key. I want to run the Lenova recovery to return it to the factory installed settings, but I want to make sure that I keep Microsoft Office. any advice?
 
Google for "magic jellybean" - - it recovers product keys -- at least the Windows key. Also find Belarc Advisor - - it lists multitude of keys
 
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