Me either.
I find it very hard to believe that an accountant would just start zipping through and destroying his work product on how they performed a client's audit, what they found, questions posed, or asked, data leading to qualifying statements regarding audits, etc.
I have worked with a CPA and it was always his practice to save all the notes, including 'message notes' where a client called with a quesiton or asked the CPA to call him back, etc., even my benign comments regarding what account # was to be used for some piece of equipment or an expense. Granted, this was tax work, but I would certainly think a large firm would be held to the same, if not better, standards.