I think you miss the point of his question.
Because the water pump is inside the engine you dont know the shaft seal is leaking until its too late. When I learned of the issue it was nearly ten years old with 200000 miles. I figured I was on borrowed time I decided to replace it before it failed
The question is... did I panic for no reason? or was I able to observe any wear or leaks
So heres my answer: I dont know Regarding leaks; the double seal (between the pump body and the block) looked and felt good. The shaft showed no obvious wobble but the shaft didnt turn freely, (not binding but just a little drag). I saw that as the beginning of the end for the shaft seal.. Im happy with my decision