I've been searching Trove for old articles about conmen to see if RB had any priors in Aus or women complaining about him years ago. I found a very similar case involving Gerd Alert Huchthausen:
20 April 1989 and
10 March 1990.
His MO is very similar to RB:
"had up to 30 aliases, wooed women in six Australian states whom he met through advertisements in lonely hearts columns and introduction agencies. But after winning the confidence of his victims — and their hearts — he would disappear, along with thousands of dollars of their savings."
He had a long rap sheet, including forgery and getting caught at CBA while withdrawing cash pretending to be someone else. And he did jail time.
I also
found his NAA file as he was of German origin. What's interesting is that officials knew he had a record, so in 1972 they considered deportation but didn't go through with it as his crimes were not
"serious offence involving violence or depravity." However, in 1978, they realised it was a lifestyle choice and appears they did deport him. I really thought this could be RB, but RB is 6'2 and Gerd is 5'3, apparently.
None the less, I can't believe how common all this is