Can my former attorney charge me to make copies of my file after I discharged him and retained another attorney?

I live in Nassau County NY and had my new attorney send notification to my okd attorney and the court that the first attorneys services were terminated and new attorney in place. First attorney still had over $1000 from my original retainer. I received a bill and a credit whereby the old attorney charged me $200 to make copies and review my file before getting it new counsel. Can he legally hold this money from me? He was charging me $380/hour and virtually did nothing on my case (divorce) hence why he was being discharged. If he had no legal right to keep this money to get my file in order (after he was discharged) is it acceptable to send him a certified letter requesting he refund me this money within 7 days? Is there specific law on this disputed fee I should address?