65 ILCS 5/11-119-5

In case any officer whose signature appears on the specified bonds or the coupons attached thereto ceases to hold his office before the delivery of the bonds to the purchaser, his signature nevertheless shall be valid and sufficient for all purposes, to the same effect as if he had remained in office until the delivery of the bonds. The specified bonds shall have all the qualities of negotiable paper under the law merchant and Article 3 of the Uniform Commercial Code.