Martin Nowak scoured the Indiana Fire Trucks website and found several X-Illinois units now serving in Indiana

Engine 193, 1976 Seagrave PB/1986 Pierce pumper formerly served Wheaton, IL. It now serves Gosport Volunteer Fire Department.

Engine 2, 1989 Pierce Lance formerly served Elk Grove, IL Elm Grove, WI. It now serves Bloomfield Fire Department.

Rescue 2, 1998 International 4900/Darley formerly served Melrose Park  until in 2009 when purchased by Center Fire Department.
 The Shawswick Township Volunteer FD has a 1976 Oshkosh P4 that served in Peoria IL. (Seen in St.4 picture.)
Engine 1, 1968 International Loadstar/Alexis formerly served Limestone Twp IL until being purchased in 1991 by Plainville FD.
Rescue 9, 1991 Ford E-350/Utilimaster formerly served Lawrenceville, IL until being purchased by Steen Township/Wheatland Volunteer  FD in 2007.