LOS ANGELES (Reuters) - The counterfeit money looked good, but there was one flaw. There's no such thing as a one billion dollar bill.U.S. Customs agents in California said on Tuesday they had found 250 bogus billion dollar bills while investigating a man charged with currency smuggling. Tekle Zigetta, 45, pleaded guilty to three federal counts of trying to bring cash, phoney bills and a fake $100,000 (57,000 pound) gold certificate into the United States in January. Further investigation led agents to a West Hollywood apartment where they found the stash of yellowing and wrinkled one billion dollar bills with...