Even though he knew the paperwork was being subpoened, he shredded right up to that point.
Did you know that in the past:

Andersen's audits have been questioned before. The firm was the accountant for Sunbeam, which grossly overstated its profits, and Andersen agreed to pay $110 million to settle shareholder suits without admitting or denying blame. Waste Management, another client of Andersen, overstated income by $1 billion. Andersen agreed to pay part of a $220 million class-action settlement and a $7 million civil penalty, without admitting liability, according to a New York Times story.

Get these bums and their crony friends out of Washington!