605 ILCS 5/6-119
When the term of any highway commissioner or clerk shall expire, and other persons shall be elected or appointed to such office, it shall be the duty of such successor, immediately after he shall have entered upon the duties of his office, to demand of his predecessor all the books, papers, moneys and other property belonging to such office.
Whenever either of the officers above named shall resign, or the office become vacant in any way, and another person shall be elected or appointed in his stead, the person so elected or appointed shall make such demand of his predecessor, or of any person having charge of such books, papers, moneys or other property.
It shall be the duty of every person so going out of office, whenever thereto required pursuant to the foregoing provisions, to deliver upon oath, all the records, books, papers, moneys and other property in his possession or in his control belonging to the office held by him; which oath may be administered by the officer to whom such delivery shall be made.
605 ILCS 5/6-119