Federal investigators, called in at the request of the management of Ploutos National Bank, recently apprehended a ring of seven embezzlers from among the bank's employees. The bank management decided to call in the federal investigators when they were unable to account for millions of dollars missing in their budget for this year. All the funds those seven individuals embezzled have been returned to the bank, and that accounts for about two thirds of the total amount missing. All seven of the accused have plea-bargained to avoid trial and are now serving in prison on reduced sentences.Which of following conclusions can most properly be drawn from the information above?
【选项】In the past, no employee had ever embezzled funds from Ploutos National Bank