Located on the Heald and Bradley Ponds Reserve of the Greater Lovell Land Trust. Info and map is in the kiosk and can be found here: https://www.gllt.org/heald-and-bradley-pond-reserve. Take the yellow trail which rises gradually to a viewpoint on Flat Hill. On a clear day one can see Mount Washington in the distance and the great rock ledges of the South and North Baldface loop trail.
There is a lot of moss and lichen at the viewpoint, so don't rush to GZ, but take your time and place your boots carefully.
The container is a camou-painted lockable, and has some tiny whistles as trinkets.