I llove this story from the Associated Press: WASHINGTON – The businessman arrived at the Treasury Department carrying a suitcase stuffed with about $5.2 million. The bills were decomposing, nearly unrecognizable, and he asked to swap them for a cashier’s check. He said the money came from Mexico. Money like this normally arrives in an armored truck or insured shipping container after a bank burns or a vault floods. It doesn’t just show up at the visitor’s entrance on a Tuesday morning. For the past few years, authorities say, [a man] and his family have popped in and out of U.S. banks, looking to change about $20 million in buried…