In February 2014, American citizen Barry Keith Webb flew into Port Moresby from Manila, with bookings to transit to Buka the same day. Airport authorities detained him after going through his baggage, which included a briefcase full of newly printed Bougainville kina totalling 1.6 million.
There are actually quite attractive-looking banknotes ☺ - see here.
Read more on this scam here.
And here's "King David Pei II" in action: