At Senate Estimates last week Mr Dolan reiterated ATSB's earlier decision not to retrieve the OBR devices.
ATSB has no interest in the content. It might confirm that the timing of and errors in the weather information transmitted to NGA misled the crew.
Why someone else hasn't already retrieved them is beyond me. If I'd been the PIC, I would have had them out a long time ago (after consulting with the insurance company).