qgiscloud.com/dncb/BirdBoxInventoryCLOUD map of nestboxes in Boundary Bay (snapshot below)
Clicking on the link will take you to an online version of the map which you can modify to find the information you seek. Roll your mouse wheel to zoom in and out of the map, and drag your mouse to move around the map. Click the “Map Tools” button in the upper right corner, then choose the “Layers and Legend” item to display a list of the layers. Click the various years on and off to see a history of nest occupancy. Click the “gear” icon, and then the blue “i” icon for each layer to display a legend of the species in each nest box.