I'm tring to do an audit of zenworks workstations but I the results
are different depending on what method I use to count them.

Running an
C1 shows 350 workstations.
Running NDSLookupForDB shows 350 devices
the Novell audit utility (LMS assistant) shows 373 ZDM devices.

How can I find the 23 mystery devices?

Zen 7 ZDM 7.01 on NW 6.5 sp6