Even if nobody else has access to those NSA recordings, US military intelligence does. For an event as world momentous as this (unless, perhaps, if there clearly and truly are benign and innocent explanations for every one of these USSS missteps), it seems most appropriate to me that an NSA/USMIL Intel announcement be made concerning its findings of this event, which would had the benefit of review of all such recordings.
Such announcement should be made no later than the release of the ostensibly-official, Congressionally-authorized report on this attempted assassination.