Keep in mind that unused Wayspots do get used as Power Spots from time to time, and it does appear that they are being used more often than the imports. So, if it is in the same L17 S2 cell as another Wayspot, it may still get used, just as a Power Spot though.
There really isn’t any official map to show all of the Wayspots in PoGo. We used to be able to use the Ingress Intel map with a S2 cell overlay, but since Ingress has stopped syncing new Wayspots, this isn’t going to be accurate all of the time. We have been discussing the importance of having a map, and you can check it out at the following link: