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The Arch9000 was obtainable in Season 28: "Cyberpunk" by being in the top 2% when the season ended.
Supply is widely distributed — no single holder owns enough to register as a hoarder.
Arch9000's current MU count is at ~164, which is similar to most other rare items (such as RedS3 or Live2020), and even lower than some rare items (such as Star Wing which is at ~206), despite Arch 9000 Glow being at uncommon.