Every trustee subject to this act who has received property for charitable purposes shall register and file with the attorney general, within 2 months after receiving possession or control of such property, a copy of the instrument providing for his title, powers or duties, an inventory of the assets of the charitable trust. If any part of the assets, income or principal of a presently existing charitable trust is authorized or required to be applied to a charitable purpose at the time this act takes effect, the filing shall be made within 3 months thereafter. If an amendment to this act first creates a duty to file, then the trustee shall register and make such filing within 3 months after the effective date of the amendment.