The inside man in a half-a-million-dollar heist at Myer's Melbourne CBD store 24 years ago claims he never got a cent from the armed robbery.

A County Court trial in Melbourne heard that the witness, whose identity is suppressed worked as a security guard.

Wladimir Babaeff, who has pleaded not guilty, pictured leaving Melbourne's County Court on Thursday. Credit:Joe Armao

trained the accused Wladimir Babaeff​, who has pleaded not guilty.

The witness claimed he told Mr Babaeff that Myer kept its cash room unlocked and there would be up to a million dollars in cash and cheques inside.