oh, I almost forgot about Ernesto's role in all this. He could also be a witness, for sure. He's so honest he'll end up telling everything that condemns Chuck in the end, without even meaning to. "yes, I would bring him ice every day because Mr. Mcgill told me the electrical waves from a freezer would fry his brain and I didn't want that to happen to him.."
Also, there is going to be some kind of loophole between the fact the copy was destroyed and the changing of the wording, for sure. They focused on 'damaged' instead of destroyed so they made them think that was the part they were fighting over, rather then the 'evidence/personal property' part.
I'm starting to guess maybe Jimmy or Chuck's ex-wife originally bought the cassette recorder and a bunch of blank cassettes, which means it wasn't 'Chuck's' personal property at all. Or, some other similar loophole. He'll also act like he was simply playing along with Chuck's delusions up until this point, and have a mountain of evidence showing this is basically all just due to Chuck being crazy with a made up vendetta against his brother.