This afternoon I received an email from Henry of the Longreach RSL Sub-Branch. One of their members had a WWII group of medals which didn't belong to their family. Henry forwarded me the details of NX82791 Edward Masterman Biddle and a picture of the medals with a request to look for the family since Eddie had died in 1990.
Eddie was pretty easy to follow through the electoral rolls and there is also quite a bit of information about him on the internet.
It took about 30 minutes (sorry Bill) to track down Eddie's nephew Colin. I've now connected Colin with Henry and the medals will be returned in the near future.
The returned medal tally is now 1763.