The State Auditor’s office is in the final stages of a probe of finances and performance at Atlantic City’s Casino Reinvestment Development Authority, after a longer-than-expected investigation. Auditors from the office began looking into CRDA’s books and records last year for the first time in the Authority’s history. “It’s taking a little bit more time than we initially thought,” said John Termyna, assistant state auditor, in an interview last month. “It became more comprehensive,” he said, adding the extended investigation was “because of some of the things that we got into.” Termyna said he would not go into details about the findings of the audit before it is published.