Hugros Hideout (Location)
A rock bandit encampment in Saqqara Nome.
Senuvision isn't as helpful here, given the geography.
Rather than coming in via the river, come in from one of the side walls, and take the ledges in.
The linear layout makes stealth kills easy, but there are also many, many arrow caches, so you can easily snipe your way through as well.
Just be sure to eliminate threats on the lower level as you go.
Stealth across a wooden platform with two unobservant guards to reach the main chamber. The treasure will be in a red box dead ahead of you (due west), and down.
Claiming this completes the mission, but you can keep poking around for minor loot. Don't forget to refill your arrows on the way out.