Creditors who have registered their security interest in the property after publication of the summons to pay serving as a seizure order but before publication of the sale, intervene in the proceedings by declaring their claim, based on the principal, costs and interest accrued to the date of the declaration. On pain of inadmissibility, the declaration is made by a lawyer’s deed filed at the registry of the enforcement judge within one month of the registration and is accompanied by a copy of the debt instrument and the registration slip and a mortgage statement surveyed on the date of registration. The declaration is notified, in the same form or by service, on the same day or the first working day thereafter, to the pursuing creditor and the debtor.