Not really sure how to answer that. The individual season Blu-rays are sold separately and have been available for some time. The box set collects everything, but it's not out yet. They are from the same company though, and the Amazon listing for the box set even says "All Region" in the title. So I think it's a good bet that you can play them in US players.

If I didn't already have all the seasons on Blu-ray, I would buy the box set from Australia instead of waiting for a US release that possibly/probably won't ever come.

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Thank you