Unless you worked in Telstra logistics, any answer is an educated guess. I'm reasonably sure that they are bought by the same company Apple use for trade-off. I believe that they export them.
A "Like" is always appreciated. If my advice is a solution, please mark it. I'm not a Telstra employee. 50 + years exp. in radio comms., eg mobile phones since 1963, two-way radios, base stations, antennas & pagers. My motto: "Doing the right thing is never wrong".