The Santa Barbara Sheriff’s office didn’t say it was a hoax. They said some of the docs appeared to be copies of Sheriff Department reports and photos, and some seemed to come from elsewhere. They further said that they did not release any documents to the media, though they did produce reports and photos to the prosecution and defense during the trial.
I would add that the pre-trial pleading I mentioned above would be a public document that anyone can look at by swinging by the records window at the Santa Barbara courthouse. Pay some fees and you could even get your own copy.