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Hyper Green Lvl5 is obtainable from both Bank Robberies, in order to get a lvl5 one, you need to have a lvl4 hyperchrome in your inventory.
Clean Green LVL5 hasn't been performing any worse in trading, however it simply doesn't perform well enough to be kept at average. This is by far the least demanded clean LVL5 (aside from Diamond right now), and it usually doesn't get that much offers as a whole. Demand wise it's also pretty similar to its duped variant, therefore the cleans demand should drop to better match it's current performance.
Duped Green LVL5 has been performing significantly worse than its clean variant. It has also been performing noticeably worse than other items around its price range, such as clean Celsior or Vantablack, and is more comparable to other below average items such as duped Vantablack or duped Torpedo. When people try to trade duped Green LVL5 + adds for a clean one, they usually have to overpay, as the duped variant is significantly worse than the clean one.
Supply is widely distributed — no single holder owns enough to register as a hoarder.