Decades ago, a Hungarian immigrant living in south St. Louis named Karlo Tanko opened savings accounts at a branch of Boatmen's Bank that would grow to $60,564. And in 1996, when Bank of American acquired that historic St. Louis-based bank, it acquired Tanko's accounts, too.But five years ago, when Tanko inquired about his money's whereabouts, he started getting the runaround.…