But if Bob, kept records, of his transaction, and could show an irregularity between the his records and theirs this could be used as evidence of a faulty system an warrant further investigation.
But you listed another issue that the law wouldn't help, the police don't believe Bob, they don't investigate, The courts don't believe bob.
I don't see how you think this different finding would change that.
In almost any case, if the cops don't believe you, and the court doesn't believe you, you are going to get screwed.