Not if most of WAMU's assets were held under the bank WMB. If that was the case it all now belongs to JPM. WMI had ~$5B in assets we know of, the $4B deposit and another $1B in interests held by WMIIC. Those assets were all distributed to Creditors during and post 2012. Is it possible there is $10B?...yes it's possible, but unlikely IMO.