Lawyers for Washington Mutual filed papers Friday in the bank’s Chapter 11 case claiming Sullivan & Cromwell, on behalf of WaMu’s new owners at JPMorgan Chase, has been sending out letters asking WaMu’s old law firms to turn over their client files on WaMu — files that include privileged material.

The letters, which WaMu’s lawyers at Quinn, Emanuel, Urquhart, Oliver & Hedges have attached as exhibits, claim JPMorgan should have access to the privileged documents because JPMorgan and WaMu are essentially the same entity now. Those entities have “joint privilege,” the letters claim.