I just came home from Bathurst Holden and was told today is the last day for dealer orders. They agreed it is a ridiculous ordering method.
Basically they said required models will need to be sourced from other dealers as the customer demand come is.

That said, Holden will run them again if the demand is there.

I also took a look at the Lowndes Special build tag and was told the Sandman one should be similar. The Lowndes version had Lowndes SSV and then the build number.
I asked if the Silver was Nitrate and told no; it had a different name but they had no colour samples etc. I assume it's not Prussian Steel grey.