bank, copied them, and returned than before the bank realized they were missing. we don't even know when they were copied. the thief may have copied them two years ago and again the day after the bank changed all the locks.
this would mean that someone, for the past two years could examine everything you did at the bank, even the stuff in your safety deposit box. they will continue to be able to get into your box until the bank changes all the locks on the doors and the master key to the boxes. changing the key to your deposit box does no good, because the thief can still enter 