What documents do I have to give to federal authorities?
If you receive a properly authorized subpoena, or a civil investigative demand, or a properly authorized search warrant, you need to comply. Don’t ignore it. That will just make things worse. Make sure your lawyer is on board, and if possible, have them review the documents before you hand the documents over. Those need to be checked for responsiveness, to see if they’re responsive, and they need to be checked for any privileges that may apply. They also need to be checked to make sure they’re complete.