Peter also said he doesn't want to do or say anything that could potentially delay the process of returning the funds, which I understand.
Legal action would certainly delay everything, potentially for years, legal action is always the last resort and Peter knows that, however if funds are returned in a couple of months and he feels there was wrong doing on the part of the︀ OCIF for closing the bank, then he could certainly take legal action in order to︁ ask for damages.
Besides right now the only one who could take legal action is︂ the Receiver as he is legally in charge of the liquidation of EPB.