(b) Delivery to clerk. Where a court has designated a clerk to receive records described in subdivision (a), delivery may be made to him at or before the time fixed for their production. The clerk shall give a receipt for the records and notify the person subpoenaed when they are no longer required. The records shall be delivered in a sealed envelope indicating the title of the action, the date fixed for production and the name and address of the attorney appearing on the subpoena. They shall be available for inspection pursuant to the rules or order of the court.