Any municipality having any undistributed or unclaimed money received from the making of any local improvement paid for wholly or in part by special assessment or special taxation, and which money has remained in the possession of the municipality for a period of 4 years or more from the due date of the last installment undistributed or unclaimed as a rebate or refund, after complying with all provisions for the distribution of such rebates or refunds set out in Divisions 2 and 3 of this Article, may set aside and transfer the money, so undistributed or unclaimed, into a special fund to be known as the unclaimed rebate fund. This fund may be used as provided in Sections 9-1-6 through 9-1-10.
65 ILCS 5/9-1-5