As a matter of interest, my perentie also had DNSDC on the original canvas, and has "RE" on the front drivers side TAC plate and "4218" on the passenger's side front.
rear tac plate text is illegible, and I had a spare tac plate in the rear box also bearing "4218"
No paperwork was supplied with mine. I found the ARN from a chassis number search.
I'd be happy to know if you work out what these numbers correlate to - as like many, I'm also looking for some history.
Mine was not fortunate enough to come with unit markings or even any hidden under a layer of paint.