Within thirty (30) days after it is the duty of the first qualifying trustee of a trust created by written instrument, other than by will, in favor of persons subject to conservatorship, to take possession of the trust property such trustee shall file in the district court of the county where the trust was created a notice of such trustee’s appointment as trustee, a copy of the instrument creating the trust, a list of the names, addresses and dates of birth of the known living beneficiaries, and an inventory under oath of the trust property which shall come to such trustee’s possession or knowledge, with an estimated value thereof.