Re: Informal Discovery
The proof that they complied with your discovery request is that you received it. What more proof do you or they need?
You can ask, but it won't happen. If they fail to comply with your informal discovery request, your next option is to file a motion to compel the production of whatever you are asking for. Even if they fail to comply with this court order, normally the court won't dismiss the case; the court will simply not allow this evidence to be used at trial. This would make it much easier to win your case.
I may not always be right, but I am never wrong.