One month after Neiman Marcus was struck by a massive credit card hack, a new report published by Businessweek sheds more light into the breach. Among the revelations: The company apparently missed almost 60,000 security alerts about the hack. According to an internal investigation by the high-end retailer, hackers infiltrated Neiman Marcus’s computer system on March 5, 2013. Four months later, malware began stealing user information from Neiman Marcus stores around the country.