so this is an issue that comes up from time to time here. what I find as a solution is not to recover/audit without first using convertenhanced. for some reason, if you are modeling in 3denhanced and use the recover/audit the bolts do not remove. so we have converted the drawings to 3denhanced then audit, line palette refresh shows all components. then convertsolids back to normal. bolts tend to stay and problem fixed.
its something we've tried and works most of the time.
hope this helps.