The security agreement shall provide that eligible securities are being pledged to secure local government deposits, together with agreed upon interest, if any, and any costs or expenses arising out of the collection of such deposits upon default. It shall also provide the conditions under which the securities may be sold, presented for payment, substituted or released and the events which will enable the local government to exercise its rights against the pledged securities. In the event that the securities are not registered or inscribed in the name of the local government, such securities shall be delivered in a form suitable for transfer or with an assignment in blank to the Town of Marlborough or its custodial bank.