I should have said, "one known case." I researched the issue a year ago by extensively Googling to see if I could find a case among the top 4 password managers

I should have said, "one known case." I researched the issue a year ago by extensively Googling to see if I could find a case among the top 4 password managers in market share: lastpass, RoboForm, 1Password, and KeyPass. I also had some direct communication with RoboForm and they claimed to have never received a report about a RoboForm database being broken into because a Master Password had been logged. And please - if anyone is aware of even a single known case among these 4 market leaders, please tell us about it.