@icebraining, You're right! The file has indeed been changed a lot lately. In fact as can be seen here: http://lerdorf.com/static.log.gz that file has changed in size from: 2602 bytes to 5821 to 1279 all in the space of 25 hours... that is really suspicious
Err, often they do. Or more correctly, they often don't show something you think they would if it happened.
Logs show a subset of what has happened. There's no way to prove they are showing everything, so there's no way to use them to prove what did not happen.