Mo. Rev. Stat. § 115.331: Receipt to be given for filed petition.

When any petition is offered for filing with the secretary of state or an election authority under the provisions of this chapter, the officer receiving the petition shall prepare and issue to the person submitting the petition a receipt indicating the number of petition pages presented from each county. The receipt shall be evidence of the filing of the petition pages subject to the determination that the petition complies with the provisions of this chapter.