The executive director or other person designated by resolution of the authority shall keep a record of the proceedings of the authority and shall be custodian of all books, documents and papers filed with the authority, the minute book or journal of the authority, and its official seal. The executive director or other person may cause copies to be made of all minutes and other records and documents of the authority and may give certificates under the official seal of the authority to the effect that such copies are true copies, and all persons dealing with the authority may rely upon such certificates.