They are missing, NOT erased
The primary person who has been searching for the lost original Apollo 11 films recently
said he THINKS they may have gotten erased and the medium reused. He does not
know for certain and the only thing that is certain is that the films have yet to be
found or made known the wider public.
Read this Universe Today article here:
http://www.universetoday.com/2009/07/16/nasa-laments-missing-apollo-11-film-makes-do-with-whats-left/
The confusion is that the beginning text makes it sound like the films were erased,
but you have to read further and more carefully to see that their true fate is still
unknown at this time.
So they aren't complete goners yet.