Hi Bob,
Are you sure that BoxTools wasn't installed on these machines? I'm looking at the rules in SCUP now and things looks good. The only way it would be detected is if Box Edit.exe is on the device in Program Files or Program Files (x86).
BoxTools (Box Edit) 4.0.8.413:

BoxTools (Box Edit) 4.0.7.411:

BoxTools (Box Edit) 4.0.10.415:

Not being detect on machines that don't have it installed:
