Cache is not at the posted coordinates. You must complete the Hamilton Street Art Adventure Lab in order to get the information to find this bonus cache. Cache is a micro that has only a logbook. Please bring your own writing instrument to sign the logbook, and replace as found.
I have waypointed the 5 spots that you will have to visit for the Adventure Lab.
The final can be found at: 43 16.MUR, -079 52.ALS
The adventure lab can be found here: https://adventurelab.page.link/fnm3