Yea ive been in the library of Kaesora pretty much all day looking for Failed Crypt Raider
http://eqbeastiary.allakhazam.com/search.shtml?id=13370
he drops a piece for monk epic so i thought well maybe this quest wasnt till after Epics...so i investigated and well nope
http://everquest.allakhazam.com/db/quest.html?quest=427
there is quest info post for this as far back as march 2001 also like 2nd or 3rd last post is talking about hte raider
(my thoughts is they just added the epic piece to his loot table with epic)
maybe also he actually does spawn and im just unlucky