To get current keys, this is excellent:
http://www.klinzmann.name/licensecrawler.htm
Here’s a command line which works on Microsoft Office 2013 32-bit, on a 64-bit system, to get the key identifier (last set of characters):
cscript "C:\Program Files (x86)\Microsoft Office\Office15\OSPP.VBS" /dstatus
The above can work in a CMD, even a remote CMD. The script does a lot of different things; for a list on the above system, try this, from the console only:
cscript "C:\Program Files (x86)\Microsoft Office\Office15\OSPP.VBS"