20 ILCS 3405/19
Whenever personal property has been loaned to or deposited with the Department and held more than 25 years and no person has made claim upon the property, the property shall be deemed abandoned and shall become the property of the Department . Provided, however, that in order to perfect the title the Department must diligently seek to find the owner by writing to the owner at the last known address by certified mail. If no claim is made within 30 days of sending the certified letter, the Department shall publish in the official State newspaper and in a local newspaper that distributes in the area of owner's last known address a notice containing the name of the owner, a description of the property, and the method of filing a claim. If no person claims the property within 90 days after the advertisement is published, title to the property vests in the Department .
20 ILCS 3405/19