When the old money is brought in there are two odd things that happen. Tao immediately notices it's the old design with Nicholas Brady's name on it and naturally remembers that he was Secretary of the Treasury from 1988-1993. For some reason it didn't occur to Tao to just look at the dates printed on the bills to see how old they were. The other odd thing is that everyone acts like this something they didn't know, as if they don't remember when the old money was in circulation just a few years before. What's more, Gabriel and Provenza, who had previously counted it to determine how much there was, act like they didn't even notice it was the old design when they counted it.