If the place of death is unknown, the certificate is filed in the district in which
the body is found within three days of such finding; likewise if death occurs in a moving conveyance, a death certificate is filed in the district where removal from the conveyance takes place. The funeral direc tor "or person acting as such" files the certificate. The personal date is obtained from the best qualified source available and the cause of death is medically certified by the physician last in attendance prior to burial. In every instance the statute requires the filing of a certificate of death before interment or disposal of the body. If the cause of death cannot be determined within three days after death, a delayed certification of the cause may be filed, but the physician or coro ner must give the registrar written notices of the reason for the delay, so that a permit for the disposition of the body may be issued.