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/
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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://www.youtube.com/watch?v=laJyHwpQHmM (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):
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