Dear Jenn,
I found Julian Casas in the WA Post office Directory at the State Library of WA, and then located Gwalia and found that it is a ghost town and that they had a museum, so I emailed the museum and had a reply back two hours later.....very chuffed I was!!!!!
They have access to old Commonwealth bank records for the town, and sure enough, he had an account!
Now.........the questions are.......were the family with him in Gwalia, and did they/he travel to Queensland prior to 1909???
Cheers
Susie