If property pins (generally made of iron or steel and long enough to extend below the frost line) were set, your property lines may be found utilizing a metal detector to locate the pins of your property. If you can locate one pin, you may utilize the recorded plat or deed or the County Parcel Viewer map to help with dimensions to establish the general locations of the remaining pins or the general location of the boundaries of your property.
The only guaranteed way to determine the exact location of your property lines is to hire an Illinois Licensed Professional Land Surveyor (PLS) to survey/resurvey the property.
Civil disputes over the location of property lines with adjoining private properties is not within the enforcement authority of Whiteside County.