Yes I was having the same thoughts as I was writing my earlier post.
My recollection was that it was white but it was during night time that I most vividly recall seeing the thing and I remain a bit hazy about daylight sightings.
Geographically it makes sense as my recollections are in reasonable high speed driving distance of canberra.
I am pretty sure I saw the vehicle as far out as the hay-naranderra area though and that is a long way from home in the middle of the night (about 400-500Kms).
But then again the driver of the 'colli' may have well wondered what the blazes I was doing driving around at there in the middle of the night as well.
I wonder if there was any another white station wagon around at any time that might explain my sightings.
I reckon the Ray Gulston explanation is the most plausible though despite the white/yellow issue.
Surely there were not many giulia station wagons (of any colour) in australia so I guess on probability alone it most likely was him.
Maybe I should try and track him down and ask him to account for himself back then.
Maybe I just had a faded yellow car 'lit up' in the night but I would swear the thing was white, like my own Giulia Super.
It was probably quite new then, 8-15 years old maybe I reckon, so it should not have faded to much at the time.
Maybe I have just forgotten though or maybe I was a little delusional at the time induced by the lack of sleep involved in long distance high speed night time intercity sprints.
I do recall that the car seemed to have 'stuff' in it like somebody was moving house...or maybe as you suggest delivering stuff.
Indeed a 'midnight run'.
These days you would suspect a drug run

...or insomnia.
To me it remains a mystery.
What on earth was this guy delivering, and to whom.... and what a great choice of transport ... although somewhat eclectic and unusual.
I strongly doubt I would have remembered the matter for so long if it had been something more umbiquitous.
Maybe Ray was running a high speed overnight courier service with the colli.
There was a guy who used to do a similar thing with an '59 ford fairlane station wagon over in south australia.
I think it was two tone green and it was the model with the wings and big round tail-lights.
The foto below is of a similar model.
It, like the colli, had a certain 'presence' on a midnight highway run.
BTY, I reluctantly have to part with my Giulia Super as I do not live in australia anymore and it sits in storage in adelaide south australia.
It is fully restored and has a fully rebuilt (the original) 1600 engine with only basic testing kilometers on it.
In other words it is not even run-in yet, maybe 300kms if that.
I do not want to sell it but I just cannot seem to get to use it and I am sick of paying storage fees.
It is time to let go as they say.
I am back in Sydney now and I am going to try to get to adelaide before I head off again.
If you know of anyone who might be interested then please pass on the information.
It is an unusual car in that I first sat in it in 1970 in the dealers showroom.
My mother bought it.
Later I bought it from her ex husband who had taken it apart and could not fathom how to put it back together again.
Fortunately he did not lose many of the parts and it just sat in a shed at the back of their house for about 4-5 years.
It was good for me because it was still in excellent condition and the disassembled bits and pieces were mostly still there in boxes.
As I had not taken it apart it was an interesting jig-saw puzzle to put back together but fortunately I knew the car reasonable well as I had driven it quite often before it came off the road.
When I got hold off it for my own nefarious purposes it had still only done under 30,000 miles and was essentially only a 4-5 year old car as it had been sitting in a shed for so much of it's life.
I have subsequently owned it since 1980 and it has spent a lot of the rest of it's life 'at rest' as I have been elsewhere or the car has been getting stripped and rebuilt for all the usual reasons Giulias seem to need an occasional rework.
It has had one major strip down to metal and and two less serious refurbishments that have ensured it has always been a very well maintained and presented Giulia.
It looks like a 6 month old car although it has now done around 80,000 miles.
It is white with a black interior and the original virtually unmarked dark grey carpets.
The police special in the attached foto's was fortunately not around when I saw the mysterious colli described above.
If it had this story may have had a different ending.