@george1421
For clarity the command Tom provided didn’t return any value, but it did set me on the right path (so to speak).
Well its not as clean as I hoped, but this command will return what I want.
find /ntfs -type d -iname "sysprep"|grep ystem32
For what ever reason sysprep exists in System32 and SysWOW64. Either way the above command will return the proper case regardless of the target OS.
[edit] And this command will find the proper unattend.xml regardless of the case.
find /ntfs -type f -iname "unattend.xml"|grep ystem32
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