Concerning Isildur and Sauruman

[Lord Elrond]

According to the appendix in LOTR Sauruman found the body of Isildur somewhere along the river and took the elenilmer from him along with the wallet and chain that Isildur wore. However Sauruman does not show up on Middle Earth until much much later. I know it isn't till at least hundreds of years later. Question is this. If Sauruman supposedly found the body of Isildur that many years later, how much of it was left, also this meant that presumeably Sauruman found it when he became Warden of Isengard otherwise he would have been evil much before it is guessed when Gandalf meets him after a council meeting and Sauruman first shows some hostility towards Gandalf. I just kind of want some other thoughts on this.