Okla. Stat. tit. 12, § 12-32
Entry on return of summons
He shall, upon the return of every summons, enter upon the
appearance docket whether or not service has been made; and, if the
summons has been served, the name of the defendant or defendants
summoned and the day and manner of the service upon each one. The
entry shall be evidence in case of the loss of the summons.
R.L. 1910, § 5332. Amended by Laws 1953, p. 47, § 1.