La. Stat. tit. 9 § 4582
In order to protect the privilege provided in R.S. 9:4581, the vendor, his heirs, or assigns shall give, at any time prior to the payment of the amount due under the policies, written notice to the insurer of the existence of the claim and state under oath the amount thereof. On the receipt of this notice the insurer shall give written notice to the assured of the filing of the vendor's claim, and in the event of a dispute between the vendor and his vendee, or of any one claiming adverse interest under oath, the insurer shall deposit, subject to the right of all parties in interest, the amount due under the policies in the registry of the court having jurisdiction in any suit that may be brought on the policies to recover the amount due thereunder. Having made the deposit, the insurer shall be relieved of further responsibility.
La. R.S. § 9:4582