Do yourselves a favour and have a look at the fines for non disclosure. It's your licence and its your responsibility. Trusting someone else with your responsibilities as PIC doesn't absolve you of yours. You would be hung out to dry if the ATSB were left in the dark over an incident and it was not reported.
This stuff is a legal nightmare. Another situation where you could get fined for following your ops manual and the whole legal argument over which takes precedence.
I vaguely recall that Jetstar have form in this department too of not reporting incidents, however that was a while ago.
Great system CASA has going............