Mo. Rev. Stat. § 115.187: Canvassers report to election authority — notice, form.

Immediately after calling at all dwelling places shown on the verification lists, the house-to-house canvassers shall report with the verification lists to the office of the election authority. The election authority shall as soon as possible prepare and mail a notice to each person who was not found to reside at the address shown on the verification lists. The election authority shall send notice by postage prepaid and preaddressed return card, sent by forwardable mail, on which the registered voter may state his or her current address together with a notice as prescribed by section 115.193.