Except again, it was Sifo-Dyas who placed the order. It was Dooku who recruited Jango. Lama Su was told by Sifo-Dyas that he would handle the recruitment, but he didn't get to as Dooku killed him. Except Dooku made sure that Nute never informed the Jedi of all this. They had bigger things to worry about than the Clone Army. Dealing with the Clone Wars were more important than finding out, if you just go by the films. You're to assume that they did try to find the Sith and found nothing. You're to assume that they searched Maul's ship and found nothing. Mace said that they would keep an eye on the Senate and in ROTS, we find out that he and the Council suspect Palpatine of being problematic. Anakin knows who he is and what he has to do, he just doesn't care. Only about Padme.