10 ILCS 5/6A-4
Upon the opening of an office of a county board of election commissioners, the county clerk and any municipal board of election commissioners in the county shall turn over to such county board all registry books, registration record cards, poll books, tally sheets and ballot boxes and all other books, forms, blanks and stationery of every description in the clerk's or municipal board's possession in any way relating to elections or the holding of elections in the county and any unused appropriations related to elections or the holding of elections in the county. Thereupon, all functions, powers and duties of the county clerk, the county board, or the municipal board relating to elections in that county are transferred to the county board of election commissioners.
10 ILCS 5/6A-4