Arthur Andersen this week begins the task of handing over some 1,600 clients to rival auditors after the accounting giant was found guilty of obstruction of justice Saturday. After 10 days of deliberations, a federal jury convicted Arthur Andersen based solely on the fact that an Andersen lawyer had ordered critical deletions from an internal memo. The case was supposed to be an easy one for the government, but the jury failed to unanimously conclude even that Arthur Anderson’s destruction of thousands of documents was illegal.