All of the BVBBS nest boxes have been mapped. You can view the map at this link - BVBBS Box Locations.
If you don't have a scrolling mouse, use the + and - keys at the bottom left of the map to zoom in & out.
When you click on a blue circle with a white bird in it, it shows the box number and location in the left side column.
For instructions on downloading BVBBS Box Locations and uploading it to Google Earth, see KML Download/Google Earth Upload.