I thought I'd finished it.
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The Gilded Scepter is a treasure found in The Predator Awakes in Sly 2: Band of Thieves. It is booby-trapped, so it has to be brought back to the Safe House within 1 minute and 30 seconds of picking it up. Once at the Safe House, it can be sold on ThiefNet for 447 coins.
While facing the temple, on the left side there should be a big bridge that has been broken into pieces. Jump on the remaining platforms and look towards the temple. On a little ledge you should see a mushroom and the treasure right next to it.