The owner of a secured claim against an insurer for which a receiver has been appointed in a delinquency proceeding in this or any reciprocal state may surrender his security and file his claim as a general creditor, or such secured claim may be discharged by resort to the security, in which case the deficiency, if any, shall be treated as a claim against the general assets of the insurer on the same basis as claims of unsecured creditors. If the amount of the deficiency has been adjudicated in ancillary proceedings as provided in this Article, that amount shall be conclusive; otherwise the amount of such deficiency shall be ascertained and determined in the delinquency proceeding in the domiciliary state of such insurer.