How to see which Key was used to activate Start 10 on a particular computer

I have several computers in my home (more than 5).  I have purchased more than one copy of Start 10.  Is there a way to see which key was used to activate Start 10 on a particular computer?  When I go to purchase history; it doesn't show which computers a particular key is attached to, or even how many or the 5 allotted copies are active.

 

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