Detectives from the Criminal Proceeds Squad arrested a man in Southbank on Sunday, July 9, as part of an investigation into attempted money laundering.
Crown Melbourne staff contacted police on Friday, July 7, after the man attended its casino and behaved suspiciously, including attempting to cash in a significant quantity of Australian currency he was carrying in plastic bags.
The 45-year-old Chinese national was then asked by staff to leave the complex.
He was then seen on Sunday, July 9, and was subsequently arrested by Criminal Proceeds Squad investigators.
A search warrant was also executed at an unrelated Southbank hotel where the man was staying as part of the investigation, with Police locating a significant amount of cash.
The man was interviewed in relation to proceeds of crime offences and released pending further enquiries. The investigation remains ongoing.