Very sad and condolences to the familys, about a 22 min flight from Bankstown so possibly 160lts of fuel and four people. That's enough for a 44.
Bankstown helicopters are such a professional outfit I would be surprised if this aircraft under there ops( but owned by an other party) didn't have the tanks done. If they didn't that might be a worry, if they were done then that's a worry in that it didn't seem to help much. All considered there will be a lot of questions about this one.