I'm also very suspicious of these legacy reports. It's so long ago. It makes it even more scary when they appear in media and allegations assumed to be true, trial by media etc.
However when I was raped, (for a number of reasons) I did not report or discuss with people at the time, until many many years later. I really wished I had done it at the time.
My inclination, for better or worse, is to believe the people reporting based on my own personal experience.