The “green goods” scam was a fraud scheme popular in the United States during the 1800’s. The scam worked by tricking people into purchasing a bag of “genuine counterfeit” money at a price much less than face value of the counterfeit money. The cash offered as “genuine counterfeit” was money supposedly printed on stolen engraving plates, but the bag of money dishonestly purchased, proved to contain only green paper or sawdust. In a way this was the ideal scam since victims could hardly report to authorities that they had been robbed in the act of purchasing counterfeit currency!
So history provides a cautionary tale to those who would purchase green goods: Only deal with trustworthy providers.