Nà bǐ qián bùzhīqùxiàng, jǐngfāng zhèngzài diàochá.
The whereabouts of that money are unknown, and the police are investigating.
Tips
usage
不知去向 is a fixed phrase typically used after a subject who has disappeared. It often implies that someone or something has vanished and cannot be located, sometimes with a mysterious or sinister implication.