You split up to cover as much ground as possible and find that those you defeated bearing perilously little. Nortuary is wearing a pair of magical gloves, but his mundane effects constitute mostly writing tools and a small notebook. A skim read of it finds it to be a work journal of sorts, chronicling mundane activities of the Iron Throne in cities abroad from Baldur's Gate. The more recent entries are mostly complaints about not being able to get any solid answers from anyone in the Gate, and being stymied at every turn, along with promises to see Rieltar and Sarevok expelled for his ill-treatment.

The guards are decked out in mundane gear, with a scattering of coin between them. The xvart, like Nortuary, doesn't seem to have kept any important notes on him - or perhaps he abandoned them before he began his attack, just in case. His headband, however, proves to likewise be magical. The rest of Senna's investigations find mundanity upon mundanity though. While the area is suffused with magic, probably from spells cast by others over time, there's nothing that strikes you as particularly notable, about either the paperwork nor about the construction itself.

Spoiler: OOC
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You find a grand total of 35gp between the enemies you killed.

Nortuary had Gloves of Heroism.
Gloves of Heroism
Wondrous Item (gloves), Uncommon
Whenever you Channel Divinity (whether Cleric or Paladin) you gain the effects of the Heroism spell for 1d4+1 rounds (no concentration required).

The xvart had a Badly Warped Headband of Intellect
Badly Warped Headband of Intellect
Wondrous Item (Headband), Uncommon

Originally a far more potent item, this item has seen wear with age and damage. When worn, it sets the wearer's Intelligence score to 15. If it is higher, this has no effect.