Oh bummer. Why is the one you're looking for always missing? It's said that the bike was bought new for use in Rupanyup, but even though it's way out in the sticks you'd think it would have been registered when new. Maybe communication between Melbourne and Rupanyup was a bit flakey. Thanks for looking!
By the way, I missed the "S" at the start of the engine number - looking more closely I see it tangled up with the "No".
Yes, R, it would benefit from a wipe over. Or better still, an occasional spin around the car park. The Auto-byke is not much of a motorcycle, but this one is a very nice example. Worth repeating something from above: the frame is fully gas welded (no lugs) at the Malvern Star factory, which was a modern process for 1948.
Leon