A third person in good faith and without a court order may act on instructions of, or otherwise deal with, a person purporting to make a transfer as, or purporting to act in the capacity of, a custodial trustee. In the absence of knowledge to the contrary, the third person is not responsible for determining (i) the validity of the purported custodial trustee’s designation, (ii) the propriety of, or the authority under this chapter for, any action of the purported custodial trustee, (iii) the validity or propriety of an instrument executed or instruction given pursuant to this chapter either by the person purporting to make a transfer or declaration or by the purported custodial trustee, or (iv) the propriety of the application of property vested in the purported custodial trustee.