On closer inspection, these are loafers. In other words, I hand't read the op's explantion correctly, that it doesn't actually trade in real USD.

OP mentions he's looking for an anonymous exchange, well look no further.

http://whiterockcottage.com/open/index.php?q=article/anonymous-money-needs-anonymous-exchange

It's something we need, and all it takes is someone willing to give it a go.