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The 4 Billion was previously bought in the garage between for 2k cash, before then being retired and becoming limited.
Supply is widely distributed — no single holder owns enough to register as a hoarder.
4Billion's current MU count is at ~155, which is similar to most other rare items (such as Champion Trumpets or Sled Void), and even lower than some rare items (such as Spyglass which is at ~160), despite 4Billion being at uncommon.