It looked promising at first, and somewhere in that pile there was indeed a (partial) service history, and a lot of receipts including the original one for the bike.
Golden nuggets consisted of a dyno read-out from when the bike was set up to suit its replacement exhaust and a K&N arfilter, and some notes on the modifications to the wiring.
Most of it, though, consisted of about four photocopies of the Morini 'Blue Book' manual, much of which doesn't apply to this later model, and almost as many copies of a contemporary MCN roadtest comparing the Kanguro to an XT350. The tester preferred the XT350.
I'm going to winnow out the chaff and just keep one of everything, so if anyone wants a photocopied, not in order, copy of the Morini Blue Book, let me know...