I've stumbled across evidence of when the Thex Dagger quest was patched into the game, and when it was removed. Both seem to have happened in October 1999.
Source for introduction:
Source for removal (I found it in the Yahoo mailing lists, though these are now only archived in my github repo, Yahoo has wiped them):
	Quote:
	
	
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 Message ID: 8668
 Date: Thu Oct 14 15:46:35 BST 1999
 Author: Mike Roach
 Subject: Patch downtime again this morning (Thursday)
 
 
 Anyone know what the purpose of today's patch is yet?
 
 Also, I noticed a strange hovering door in Highkeep last night in the main
 entryway courtyard when you first come in that must be some kind of bug and
 the High Elf who starts the Thex Dagger quest was gone and my "Princess
 Lenya's Amulet" had its name and graphic changed to "Thex charm" or
 something like that.
 
 I also have a question, I finally have some plat saved up to where I can
 begin to buy some steel armor to replace my ugly bronze until I can start
 moving forward to Lambent so does anyone know if I can find size "medium"
 steel plate armor for sale in either Freeport or Qeynos? I know it is sold
 in Kelethin but I am not sure if you can find it at these other cities.
 
 -Faras
 
 https://github.com/dbsanfte/eq-archi...ards/8668.json
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 Hopefully this will now be correct for Green 2.0 
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