npub1qv…y6ghq on Nostr: I filed a FOIA to the FBI to disclose Sabus Twitter DMs from his time as an FBI sting ...

I filed a FOIA to the FBI to disclose Sabus Twitter DMs from his time as an FBI sting operation a while ago (https://www.muckrock.com/foi/united-states-of-america-10/twitter-dm-history-of-hector-monsegur-sabu-with-halvarflake-137919/?), but the reply was "can't confirm nor deny existence". Clearly the FBI must've had these records (they reviewed and monitored Sabus comms).

Is there a way to appeal?