Only if the vehicle was sold in NSW, because the records on most other Eastern states have been lost.
In your case however, your vehicle is unmolested. 
 
Did you ever get other details on its history?
It was originally a NSW Police vehicle, delivered on 20th May 1971, always a hard top, it may have had security mesh (like cargo barriers are made from) installed inside and a cargo barrier, most Police 88" in that era did.
Dunlop Road Track major tyres, ignition key F?-896, Drivers door and tailgate F?-683 & 891.
The rego looks like it was BIO-022 but can't be sure.
Isuzutoo-eh also has a NSW Police SIIa.
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