How to verify office 2013 product key matches working cpu

I am messed up some paperwork two years ago, and I am left with an Office 2013 home and business key card that was accidentally marked as "CPU123".  That is clearly wrong because CPU123 has Office 2010 installed, and it was installed from a retail fpp disk.  

So, that caused me to audit everything, and I have narrowed things down.  The key card belongs to either CPU234 or CPU235.  But, I can't figure out which.

I tried the following command line which is supposed to report the last 5 digits of Microsoft's 25 digit product key.

cscript "C:\Program Files (x86)\Microsoft Office\Office15\OSPP.VBS" /dstatus

But, both CPUs report "p34p3".

I suppose we might have activated both CPUs with the same key card, but that is supposed to be impossible, so I don't think that is what is happening.

Does anybody have any idea of how pin things down?  I am considering
control panel > programs > change office 2013 > enter a product key.


But, I have never done that on an installation that has already been activated.  I am worried it might clobber things.

Any other ideas would be helpful.  Another question that might help, does anyone know how to tell when the currently executing Office 2013 was installed?

Rberke