Hi Rahman,
I don't know it they had iron in the place you mention in Australia, but Australia sounds more reasonable than an African import, as iron was to be had from countries much closer than Africa.
I don't know about the rest of SEAsia, but in India they had enough iron, not only for their own use, but they also exported hundreds of tons westwards each year, from the towns in the south. As the Indians also traded eastward, it is likely that the also exported iron to the rest of SEAsia. Another thing is, that the Indian iron can have been so expencive, that many had to get the iron they needed in other ways.
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