There is no such thing as a HX or HZ Kingswood Sandman so if you have a 8WN HX-HZ van or ute it is definately not a Sandman, paint and trim colours are irelevent.
There is no such thing as a kingswood HQ or HJ p/van. The only Sandman available in Kingswood variant was the HQ and HJ ute. HQ and HJ don't appear to have any Sandman unique trims and metallic paint only applies to the base model 8WM as metallic paint was optional on Kingswood.

HZ is a Sandman if you have 18V, 33C, 11C or 77C trim codes in any colour. 77T is not a Sandman trim code.

Flamenco Red, Jasmine Yellow, Mojave Beige, Palais White on a November 78 or later built car are the only colours base models were available in so if it doesn't have one of the four Sandman unique trims and isn't XX7 or XU3 plated there is no way to prove it is a genuine Sandman.


3) vehicle is in original condition, has all Sandman identifiers, original paint with original Sandman decals (document with lots of pictures before restoration)

The red Belmont HQ ute is a perfect example for this, has all Sandman features and original paint and decals...... pretty hard to dispute it's Sandman heritage unless you are extremely anal. However once it is restored you could easily dispute it, hence why I say photo document it in it's original state before starting a restoration.