The cache is not at the published coordinates.
To get the coordinates, you have to complete the Adventure Lab cache 'The Forest that is not French'. This adventure will take you on a tour past of some historical sites in Frenchs Forest. When completing the final stage of the Adventure you will get the coordinates for this cache.
At the location of the virtual cache is an intersection which used to be called 'Blinking Light's Intersection'. The background picture shows the intersection in 1960. Here is a picture showing how the same intersection looks today.