Doesn't make sense though. pB said the same stall is re-done later in the same day. As you can see in one of his pics, there are 3 wads of paper in the same stall, from the same day. The stall has been used by others and the Wadsmith doesn't care.
I saw the picture of the three, I included that in my thoughts -
I think the three wads of paper on the floor are from him using the stall three times. He opens the door, the paper falls, when he is done he puts a new wad in place. Someone who is weird enough about hygiene to try and ensure he is using a pristine toilet is not picking paper up off the floor.
It is not 100% but it is the only explanation that comes close to logical for me.