Did the pizze delivery person give you back the fake bills? Be careful, sometimes they say their fake hoping you'll give them another bill and they'll keep the "fake" one and possibly use it on someboday else. Once at BROU in Colonia, he told me I had to fake $100 US bills because they were tinted from some liquid. He was going to keep them, according to Uruguayan law, but since he wasn't 100% sure they were fake he didn't take them. I traveled to Australia and changed them for AUD and they accepted them. Hmmmm. Makes me thing the teller at the bank in Uruguay wanted to make a profit.