The Fair Work Ombudsman (FWO) is currently holding over $2.5 million in trust for around 10,000 people who were underpaid in a former job but cannot be located.
Fair Work Ombudsman Sandra Parker said compliance and enforcement activities regularly find underpayments of both current and former employees.
"If an employee is owed money but has left the business and can't be located, these entitlements are held in trust until we are able to find them," she said.