Mattrensa,
Do you have the chassis number for the vehicle, let us know, and we can check the records.
All of the Australian 2A 1/4 ton vehicles were built from 1963 onwards, if your vehicle is a CR, it should have been built in 1959.
Easy to tell though, all of the CRs had a standard chassis, as per civilian spec, without the raised spring hangers.
It is possible that your vehicle may not have its original cross member?
The Warning placard is one of these, they were originally fitted at the factory when the vehicles were new.
Sorry, I don't really know how the BMLC NZ plate happened, possibly when it was purchased by the Kiwis?
Let us know what else you find, a rare vehicle in the UK!