Of course it's a big deal. This indicates that North Korea might have been in the business of counterfeiting US currency. Inserting lots of counterfeit bills in the economy is not a good thing for the US. They could have counterfeited billions of dollars for all we know.
In addition, why didn't the UN report this back when it first got the fake money? Was it to protect a communist regime? This thought crosses my mind as some of the UN's founders were communists.

Kramer

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“It's time to admit that public education operates like a planned economy, a bureaucratic system in which everybody's role is spelled out in advance and there are few incentives for innovation and productivity. It's no surprise that our school system doesn't improve; it more resembles the communist economy than our own market economy."
Albert Shanker, former president of the American Federation of Teachers