Hi,
We have a method to find the last 5 digits of the product key, I think it will be enough for you to determine which product key you actually need then.
Press Win + R, type "cmd" in the blank box, press Enter.
Type the following based on your Office and Windows version:
Office 2010 (32-bit) on a 32-bit version of Windows
cscript "C:\Program Files\Microsoft Office\Office14\OSPP.VBS" /dstatus
Office 2010 (32-bit) on a 64-bit version of Windows
cscript "C:\Program Files (x86)\Microsoft Office\Office14\OSPP.VBS" /dstatus
Office 2010 (64-bit) on a 64-bit version of Windows
cscript "C:\Program Files\Microsoft Office\Office14\OSPP.VBS" /dstatus
I hope the information is helpful to you.
Regards,
Melon Chen
TechNet Community Su