The whole line of thinking here is very odd to me.
I mean, what good is evidence that you keep to prove you aren't lying if the evidence is never meant to be shown? And if it is meant to be shown you'd be committing a crime by doing it, which would be especially silly just to prove to someone you wouldn't make up such a mundane story.
Either way you should just delete that file. It serves no useful purpose (eg. you can't show it to me to prove you're not a liar) and despite all the good intentions you have shown in the past in getting the issue fixed you are likely committing a crime simply by keeping a copy of it around.
I mean, what good is evidence that you keep to prove you aren't lying if the evidence is never meant to be shown? And if it is meant to be shown you'd be committing a crime by doing it, which would be especially silly just to prove to someone you wouldn't make up such a mundane story.
Either way you should just delete that file. It serves no useful purpose (eg. you can't show it to me to prove you're not a liar) and despite all the good intentions you have shown in the past in getting the issue fixed you are likely committing a crime simply by keeping a copy of it around.