So, if a US citizens has 10 see notes in his pocket. Sells them to a friend for 12 k of legal Argentine Peso's. According to the lady at one of the Cambio's on Florida today, he cannot sell them to her without a receipt from her store. But she said they can be sold to a bank, no questions asked for 8 peso's to a dollar, no receipt needed.. I rounded the numbers off. So, Hypotethically the gringo now has 1,500 USD. I know this can't work, but will some one please tell me why?