Subscribe | UPI Odd Newsletter Subscribe YSTRADGYNLAIS, Wales, May 31 (UPI) -- A retired Royal Mail postman is under investigation for failing to deliver 40,000 pieces of mail found at a Ystradgynlais, Wales, recycling center. While the vast majority of the undelivered mail was advertisements, it did include 3,000 letters that were at least a year old. It took three Royal Mail vans to haul everything away, Web site icWales reported. Advertisement The government agency promised to make certain the 3,000 letters are delivered with a written apology to each postal patron in the Swansea and Amman valley areas of Wales. "All the letters will be re-delivered as soon as possible, probably within the next week," a Royal Mail spokeswoman told the Web site. "We are conducting an investigation and it involves a former postman who is now retired," the spokeswoman said. The spokeswoman also pointed out that the Royal Mail's lost-or-stolen rate is just 0.006 percent of 22 billion items handled each year. That would translate into about 1.3 million pieces of mail.