the company are required to publish the open time when closed and allocated. if you dont get something you are entitled to enquire of the open time officer why it was allocated to someone else.
if you are not satisfied and believe that the EBA has been breached you can call the union as many do.
They can speak to the Duty Manager and ask them to review the decision of the OT officer. If there is any monkey business it will become obvious.
If anyone has proof of bribery rather than anecdotal clap trap i suggest a stat dec taken to the FAAA and then it will go directly to qantas security for investigation. Just make sure you have your facts straight and some proof. Its slanderous to make false or speculatory accusations and the OT officer will have recourse if the individual is just p'ssed off and letting out some frustration.
Ot officers are required to find the best fit for OT within the constraints of the EBA, anyone can make mistakes and if you think one has been made get in quick and have the decision audited.
THere is a clause in the EBA that says an error can be corrected in relation to the allocation of open time...if you have your proof use it