U.S. Internal Revenue Service (IRS) Commissioner Douglas Shulman speaks during an interview with Reuters at his office in Washington October 8, 2009. To match interview TAX-OFFSHORE/        REUTERS/Hyungwon Kang  (UNITED STATES CRIME LAW BUSINESS POLITICS) WASHINGTON, Oct 14 (Reuters) – Thousands of wealthy Americans have volunteered information about unreported income hidden in overseas accounts ahead of the deadline for a U.S. government tax amnesty program, the U.S. tax commissioner said on Wednesday.