Trying to find an Australian Commando

I am trying to locate the owner of a red 1975 Norton Commando Roadster that went to Australia a few years ago. I am the previous owner and I have found a binder of material for the bike. It includes the original purchase receipt and many other receipts and documents. The engine number is 325619 and the frame number is 850F126545. At the time I sold it it had yellow after-market coils. At the time of sale it had California license plate 75MKIII or was it 75MK3? I don't remember. If the owner can be found I will send off all the docs. Thanks.