No such luck, but that Shift+F10 trick is very handy, thanks.
C:\Windows\Panther>type unattend.xml | find "Product"
<ProductKey>XXXXX-XXXXX-XXXXX-XXXXX-XXXXX</ProductKey>
The key matches the spec's ProductKey, and it's not really all Xs. Running slmgr.vbs /dlv on the clone, Remaining Windows rearm count is 2. I take that to mean sysprep was not run previously, so I was surprised to find the 2012 log entries below. But maybe I'm misunderstanding, or the vm was cloned without sysprep, and\or initial startup logging writes to these files; I was surprised because I assumed the logs to be specific to sysprep.
"Product" appears 3 times in C:\Windows\Panther\UnattendGC\setupact.log :
2012-12-26 22:52:10, Info [msoobe.exe] Service sppsvc reports as running
2013-02-01 15:47:58, Info [Shell Unattend] Starting service sppsvc
2013-02-01 15:47:59, Info [Shell Unattend] Service sppsvc reports as running
2013-02-01 15:48:08, Info [Shell Unattend] ProductKey set
2013-02-01 15:48:08, Info [Shell Unattend] Exiting 'specialize' pass with status 0x001f1000
2013-02-01 15:48:08, Info [DJOIN.EXE] Unattended Join: Begin
2013-02-01 15:48:08, Info [DJOIN.EXE] Unattended Join: Loading input parameters...
2013-02-01 15:49:10, Info [oobeldr.exe] Flushing registry to disk...
2013-02-01 15:49:10, Info [oobeldr.exe] Flush took 328 ms.
2013-02-01 15:49:10, Info [oobeldr.exe] Successfully completed RunSMIPass for oobeSystem.
2013-02-01 15:49:10, Info [oobeldr.exe] No reboot has been requested for oobeSystem unattend.
2013-02-01 15:49:10, Info [oobeldr.exe] Successfully ran oobeSystem pass.
2013-02-01 15:49:10, Info [oobeldr.exe] Launching [C:\Windows\system32\oobe\msoobe.exe]...
2013-02-01 15:49:10, Info [msoobe.exe] Starting service sppsvc
2013-02-01 15:49:11, Info [msoobe.exe] Service sppsvc reports as running
2013-02-01 15:49:11, Info [msoobe.exe] Successfully created first boot reg key
2013-02-01 15:49:11, Info [msoobe.exe] Found SkipMachineOOBE value
2013-02-01 15:49:11, Info [msoobe.exe] Running mandatory tasks
2013-02-01 15:49:11, Info [msoobe.exe] Doing background work directly in MandatoryTasks; eType=1
2013-02-01 15:49:13, Error [msoobe.exe] Failed to install product key [hr=0xC004F050]
2013-02-01 15:49:13, Info [msoobe.exe] Starting service netprofm
2013-02-01 15:49:15, Info [msoobe.exe] Service netprofm reports as running
2013-02-01 15:49:15, Info [msoobe.exe] Successfully signalled event to start up services