Right... Someone - anyone is going to take a billion dollar bill seriously... Like anyone could make change...
The "bill" is obviously useless. How can it be a crime to have one???
I believe 10 Japanese investors were recently conned out of $125,000 a piece (over a milion total) on some investment scam involving the purchase of a rare and collectible US $1,000,000,000 bill. I am sure they were all the kind that would fall for the Nigerian gag.
How is it even a counterfeit as there is no real one? What is it a counterfeit of? If he tried to "pass" one he would be guilty of fraud, though.
During the early days of the California Gold Rush there was a lot of privately minted coinage. I don't know if this story is true, but I've read that a man successfully defended himself against counterfeit charges when it was discovered that the gold coins he was circulating had a higher gold content than the Federal coins!