You can't get a guise anymore, but for a mask of deception, you can just park your rogue down there and wait for someone to do the camp. It rots a couple of times a day depending on how many people pass through the zone.
The named mobs see sneak/hide, but you can peak up while staying on the ladder.
If you see the assassin and he's not wielding anything, it has the mask, so just ask around if someone will come help you kill it.
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