Gibcarver, the quote you have there is for the Penmaster, not the Penkeeper.
It's easy to get confused...
The Penkeeper is supposed to spawn inside the cell that has a fake wall, which is next to the cell with a busted down door in the jail area. He is a common spawn. The reason why he spawns there and why he is common is because his keys are used to get out of the jail area, because the cell doors were locked before the revamp.
If you fell down the pit that lead to the "enslaved iksar" cell, you could still pull the penkeeper with ranged as he was visible at an angle. Why do I know this? Because I did Droga to death back in the day and when I did my shadowknight quest, I stupidly thought the bone key and the bone key necklace were off the penkeeper and camped him for ungodly amount of hours, before finding out that it in fact dropped off the Penmaster which had 2 place holders (both spiders, however there is only 1 place holder on this server).
The goblin interrogator spawns in the cell with the broken down door.
Right now on this server, both the interrogator and penkeeper spawn points are unoccupied.
I have reported this in the bugs forum and have found these old magelo links to where they should be spawning.
http://eq.magelo.com/npc/419503
http://eq.magelo.com/npc/419984