What she asked to see isn’t the point. It’s perfectly acceptable to ask for more evidence. I don’t take issue with that.
It’s unacceptable to call two people liars based on an assumption that the toner transfer could only have taken place with the receipt folded behind the BC inside the envelope.
We’ve established that there are other circumstances under which the toner transfer could have occurred.
Your scenarios depend on El Sordo being “mistaken”, which is a short hop away from what MT said. The way that El Sordo explained the situation does not make sense with the documents we see. Whether there is a good explanation for that depends on what El Sordo saw, which Danae can post for us and which should answer the questions. That’s probably the first step that needs to happen. The sooner it can happen, the better, to prevent any of us from saying things we’ll later wish we could take back.