Andrew
158603 would be the ARN number . Contact the AWM in Canberra as they have the records that will tell you when it was disposed of etc.
Or you can
email Mike Cecil who frequents this forum occasionally, he is the curator of technology at the AWM .
Do you have the ex Tom DWYER dukw ? It went from Victoria to Tasmania years ago .
I lived in Tasmania for some time , not many ex mil vehicles around , just a few blitzes .
Mike
[edited by moderator to hide the e-mail address - this minimises the chance of mis-use by spam robots]