Theban Archive (Location)
A two-treasure location in downtown Thebes. You'll pass through during the main quest Aten Rising.
The best point of access is the high window marked by the 'secret entrance' icon in Senu-vision.
This area is heavily guarded and often patrolled, but the linear arrangement of the guards makes it easy to go from stealth kill to stealth kill.
Clear the upper level, then retrieve the first treasure from a large white chest.
Kill your way down the stairs, and you'll see the last treasure in a red chest, behind a writing desk. Claim it to complete the location.