I unfortunately skipped page 2 of this thread and was wondering why the xcopy command was copying all of the contents of the SMSPKGn$ share and made a little more flexible workaround.
Instead of needing to reference the package name in the xcopy command, you can instead:
1) Create a batch file and name it, for example, install.cmd in the USMT x86 source folder with the following content(s):
xcopy "%~dp0*" %Systemdrive%\USMTbits /herciy
2) in the Xcopy task sequence, change the commandline to simply "install.cmd"
This can be done for each XCOPY TS and eliminates the need to reference the Package ID.