board minutes

Yes and yes. A board meeting will have an agenda - including agreeing the minutes of the last meeting (first item on the agenda) and "any other business" (last item on the agenda). Someone (e.g. the company secretary, where there is a company secretary) will "take minutes" of the meeting - which will not be verbatim but will record the main points and, most importantly, any agreed action. In the UK, accurate minutes of board meetings are required to be kept for at least 10 years (Companies Act 2006). If, for example, the board is discussing threatened legal action by an employee for "unfair dismissal", the agreed action might be - "let's wait and see if he sues, it's just retaliation because he was dismissed for gross misconduct" - or it might be "let's offer him $x if he signs a non-disclosure agreement (to make the problem go away)". There is nothing "too confidential" for the auditor to know.