[Non-Sequitur]

Most likely it came from North Korea about 6 years ago, somebody used those funds to buy something and it went into circulation, something big and expensive. These notes are extremely good and had a lot of banks worried some years ago, actually this is old news of a sort.

No chance. The article says that they've detected 19 different versions of the note, each version corresponding to a tiny change in the U.S. engraving plate. Why would any counterfiter go to that trouble when they can keep on cranking out their older version? A more plausible explanation might be that every time the Bureau of Engraving created new plates a second set was made for the purposes of this program. Then they embedded an identifying flaw and kept on printing their notes for their own purposes.

[UCANSEE2]

“A more plausible explanation might be that every time the Bureau of Engraving created new plates a second set was made for the purposes of this program. Then they embedded an identifying flaw and kept on printing their notes for their own purposes.”

You are the closest to the truth, so far.
Who was it that Made a line trip to NK to cozy up to Lil Kim?