If the deposit is of mortgages, it shall be accompanied either by full abstracts of title with the fees for examination of title, or by policies of title insurance or certificates of title issued by an admitted title insurer. The fees for appraisal of the property shall be paid by the insurer making the deposit. In any case where he ascertains that the expense thereof would not be unreasonable or such as to make the deposit impracticable, the commissioner may require a policy of title insurance or a guaranty that the abstract is correct and that it shows title to be in the proper parties, issued by a corporation authorized to issue such policies or guaranties in the State in which the security or some part thereof is located.