They also wore hidden earpieces, through which they allegedly received instructions on when to wager on card games.
A New South Wales Police spokesperson told the BBC that they were not currently looking for any other person in relation to the alleged fraud.
In a subsequent search of their accommodation near the casino, officers found other “gambling props”, high-end jewellery and €2,000 (£1,750; $2,320) in cash.
The pair appeared in court on Friday and were denied bail, New South Wales police said.
Mrs Israilova is due back in court in February, the Guardian Australia reports, while Mr Israilov is scheduled to appear on 11 December.