I predict that unless it is proven that they fabricated evidence, the person on trial will still get convicted, and the MPAA will get nothing more than a verbal slap on the wrist.
Deletion of exculpatory evidence is one thing, but deletion to hide a source is simply redaction, which governments do daily. They will laugh it off as a minor oversight.
... and you're suppose to just take their word that those were the only changes? If they had access to make changes then the chain of evidence is tainted... who knows that happened.