If you know where you lost something, does that help you find it? I lost one lens cap when I slipped on a rock crossing a stream. It popped off the camera and likely went in the water. Since I did not recover it immediately, it was gone. As that was one of many scout hiking trips, I really don’t know where that was. I remember the moment of loss, but not the place. And it was more than 10 years ago.
I lost another lens cap in Brussels, Belgium this past fall. In this case I was not aware of the moment of loss, but I noticed when it was gone. Again, I was not able to recover this one either, because I didn’t even know the moment it was gone.