Assassin's Creed Origins: Investigate the Royal Scribe's office - End of The Snake

Investigate the Royal Scribe's office is an objective in Assassin's Creed: Origins (ACO).

Memory

Go forward to the first large room on the left.
There are 3 items that can be investigated at this location.
In the back left there is a ladder, on the table to the right is a letter, and at the foot of that table you can find a locked chest.
Go to the wall on the left, with the fallen ladder.
Climb up onto the scroll rack and up to the top of it.
Head over to the left and cross over to the next rack on the left.
On top of this rack is the key for the chest at the foot of the table.
Go over to the chest and interact with it for Bayek to learn more about what he needs.