purchaser of registered land sold for any tax or assessment, shall, within five (5) days after such purchase, file in the office of the registrar a written notice of such purchase, thereupon the registrar shall enter a memorial thereof upon the certificate of title,and shall mail to each person named in the certificate, and in the memorials thereon, a copy of said notice. Unless such notice is filed as herein provided, the land shall be forever released from the effect of such sale, and no deed shall be issued in pursuance thereof.
SOURCE: CC ‘1157.76.

§ 29178. Tax Deed: Registration: Effect: Application for
Decree Showing Title.
A tax deed of registered land, or of any estate or interest therein, issued in pursuance of any sale for a tax or assessment made after the taking effect of this Law, may be presented by the holder thereof to the registrar, who shall thereupon enter upon the register a memorial of such deed; but such deed, unless the same shall have been issued to the government, shall have only the effect of an agreement for the transfer of the title, and before any certificate of title shall be issued for the land described in such deed, the holder thereof must file with the clerk of court an application for a decree showing the title to said land to be vested in him.
SOURCE: CC ‘1157.76.

§ 29179. Same: Notification of Persons Interested on
Application for Deed and Proceedings on.
All persons appearing upon the register to be interested in said land, and also the person who appears by the tax collector’s books to have paid the tax or assessment last paid before the sale on which the deed is issued, shall be notified; and any person claiming any interest in the land may, upon the hearing of such application, show, as cause why a certificate of title should not issue to the holder of said deed, any fact that might be shown in law or in equity on his behalf to set aside such tax deed, and the applicant shall be required to show affirmatively that all the requirements of the statute to entitle him to a deed have been complied with.
SOURCE: CC ‘1157.77.