As I mentioned, we're updating our investigator's manual, and I will put a chapter in the manual on caution letters, and a generic draft of one so that people can see what they are.
Most of the caution letters deal with referrals from Elections Canada, and they don't require a lot of investigation, because they have the paperwork there that shows that somebody filed three months late: there's the document; there's the date on it. So we don't need to do an investigation.