I mentioned…that MDT 2012 Update 1 no longer uses SETUP.EXE to install Windows 7 and above. One side effect of this is that $OEM$ folders are no longer going to be copied, since that was something that SETUP.EXE did that the MDT LTIApply.wsf script doesn’t handle.
for those of you out there that are using them, you can leverage the attached script (see the attachment link below) in your task sequence to do that.
Check out the full post which describes the method used and walks through the script specifics: Copying $OEM$ files and folders with MDT 2012 Update 1
Grab the script: CopyOEM.zip