25 man research:
Patch 2.1: All 25 man raid bosses who drop set tokens will now drop an additional token.
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High King Maulgar pre-nerf= 1 token other 1 Item:
August 9 2007 AFTER patch 2.1 has 2 tokens and 1 other item: http://steellegion.com/king-maulgar-dethroned/
February 15 2007 BEFORE patch 2.1 has 1 token 1 other item: https://www.deeprunpestcontrol.co.uk/2007/02/15/king-maulgar-gets-a-mauling/ ("Loot was the Tier 4 Shoulders for Benisaro and Malefic Mask of the Shadows for Lanariel"
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Gruul pre-nerf= 1 token other 2 items: https://youtu.be/06rYTdIwX8I?t=390
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Magtheridon pre-nerf= 1 token  2 items: https://youtu.be/QpgdAHJANcA?t=457
NO HEAD, this got added in patch 2.1: http://www.mmo-champion.com/threads/601317-2-1-0-Loots-We-want-moar-! ) (http://www.wowhead.com/quest=11003/the-fall-of-magtheridon#comments:id=89927)
NO "Black Sack of Gems", this got added in patch 2.4. This one is important since you can now loot epic gems, but epic gems got added with BT + Mount Hyjal: https://www.engadget.com/2008/02/25/patch-2-4s-magtheridon-the-new-onyxia/
(The wowwiki states 2.3.3 but this is wrong, guilds during 2.3.3 did 2.4 PTR hence why there was a discussion about this item during the live 2.3.3 patch.)
NO "Pit Lord's Satchel", got added in patch 2.4: https://www.engadget.com/2008/02/25/patch-2-4s-magtheridon-the-new-onyxia/
http://wowwiki.wikia.com/wiki/Pit_Lord%27s_Satchel
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Karazhan amount of item drops:

Beast boss should only be 1: https://youtu.be/GhY-voTvYm0?t=138
https://youtu.be/Tj3VsFXVSO0?t=78
https://youtu.be/DhumY2csIq0?t=106

This is obvious but still putting it here so we can see difference between token dropping bosses vs none token bosses in Kara
NONE TOKEN BOSSES = 2
Moroes: https://youtu.be/VH8h-sMmlL4?t=375 (14 February 2007)
Maiden of Virtue: https://youtu.be/8MRs5AapuK0?t=298 (12 March 2007)
Shade of Aran: https://youtu.be/ZJQoSAUaOpc?t=403 (16 march 2007)
Not going to list m all but you get the idea :D

TOKEN BOSSES:
The Curator seems to be 1 token and 1 other item: https://youtu.be/laJyHwpQHmM?t=429 (February 8 2007). You can see only 2 items getting linked, the items being: Forest Wind Shoulderpads and Gloves of the Fallen Champion
These videos are from 2008, but it seems like amount of Karazhan loot pretty much stayed the same whole xpac except for the added badges):
https://youtu.be/QH6k8wfrRhM?t=310
https://youtu.be/U8n68drmCTY?t=424
https://youtu.be/I2dDmmPdVEc?t=197

Prince Malchezaar should be 1 token, 1 of the weapons, 1 other items
(6 February 2007) https://youtu.be/n6MmRgYu5ro?t=507
Guild site stating this as well: https://www.deeprunpestcontrol.co.uk/2007/02/11/prince-malchezaar-gets-the-malkey/ ("Loot was the Tier 4 Helm for Umodoko, Farstrider Wilder Cloak and Light’s Justice.")
Another guild: http://steellegion.com/prince-malchezaar-cleared/ (Malatov won his T4 hat, Trichiasis received the healing cloak, and Adrexius now wields a new axe)


Only 1 token: http://www.wowhead.com/karazhan#comments:id=332800