Check the time, send any good occlumens with a time turner back for 6 hours, have them tell another good occlumens with a time turner to go back 6 hours, the time that it was when the first person went back in time, and have them ask yet another good occlumens…
Do that however many times you need to
Have someone actually film whatever happened, then wait until it is right after the time that the first person went back in time, show everyone the film.
That way:
a) An occlumens will not accidentally give away their secrets b) Time will not be changed, since they waited c) You know it’s real, since it’s on film.
I have a solution for Harry.
Check the time, send any good occlumens with a time turner back for 6 hours, have them tell another good occlumens with a time turner to go back 6 hours, the time that it was when the first person went back in time, and have them ask yet another good occlumens…
Do that however many times you need to
Have someone actually film whatever happened, then wait until it is right after the time that the first person went back in time, show everyone the film.
That way:
a) An occlumens will not accidentally give away their secrets
b) Time will not be changed, since they waited
c) You know it’s real, since it’s on film.
I believe it was established earlier in the series that no chain of time turners can send information back more than 6 hours.