If ((they)) run the fed do they even need to be that clever about it?
The money printers themselves are nothing that special. The secret to most of them is 'what' they do, maybe a little of 'how' they do it, but you can build your own as you know what it's doing. Consider that most countries have similar anti-counterfitting measures to the US.
Also, I remember a history channel documentary where when they talked about some of the suppliers to the BEP 'Family Owned for generations' came up at least once. Possible connections there?