765 ILCS 1020/28
In all cases where such lost goods, money, bank notes or other choses in action shall not exceed the sum of $100 in value and the owner thereof is unknown, the finder shall advertise the same at the court house, and if the owner does not claim such money, goods, bank notes or other choses in action within 6 months from the time of such advertisement, the ownership of such property shall vest in the finder and the court shall enter an order to that effect.
If the value thereof exceeds the sum of $100, the county clerk, within 20 days after receiving the certified copy of the court's order shall cause a notice thereof to be published for 3 weeks successively in some public newspaper printed in this county and if the owner of such goods, money, bank notes, or other choses in action does not claim the same and pay the finder's charges and expenses within one year after the advertisement thereof as aforesaid, the ownership of such property shall vest in the finder and the court shall enter an order to that effect.
765 ILCS 1020/28