10 ILCS 5/5-26
If either of the original or duplicate registration cards, or all of any elector shall be lost, destroyed or mutilated in whole or in part, the county clerk shall prepare 2 new registration cards, an original and a duplicate and shall require the execution of a new registration affidavit by such elector, and if any such elector shall refuse to execute such affidavit within thirty days after the mailing of a notice to such elector at the last address from which he has registered, then the registration of such elector shall be cancelled. If either the original or duplicate registration cards, of all registered voters of a city, village or incorporated town, township or any ward, or precinct thereof, shall be lost or destroyed, the county clerk shall require a re-registration of electors of such city, village or incorporated town, township, ward or precinct and the same provisions as required for any registration under section 5-17 of this article 5 shall apply to such re-registration.
10 ILCS 5/5-26