https://backpack.tf/item/7747116349

15 keys (the unique taunt wasn't involved):

https://backpack.tf/profiles/76561198106267533#!/compare/1707350400/1708300800

https://backpack.tf/profiles/76561198343527617#!/compare/1707264000/1707350400

https://backpack.tf/item/5369871550

15 keys:

https://backpack.tf/profiles/76561198144346135#!/compare/1706572800/1707004800

https://backpack.tf/profiles/76561197960779304#!/compare/1706659200/1707091200

https://backpack.tf/item/4071635216

Dumped to Quicksell.Store, Convulsive Fiery Taunt: Rock, Paper, Scissors matches:

https://backpack.tf/profiles/76561198126522616#!/compare/1704326400/1704844800

https://backpack.tf/profiles/76561198850121720#!/compare/1704585600/1704672000

11 keys:

https://backpack.tf/profiles/76561198850121720#!/compare/1705104000/1705190400

https://backpack.tf/profiles/76561198132731667#!/compare/1705104000/1705190400

Buyer are a little over 11 and 11 isn't a common trading point so I think it should be fine to exclude it and go with 15 keys flat, I can't find a snapshot for the exact day it sold but on January 20 buyers were at nearly 13 keys https://next.backpack.tf/classifieds/snapshots/Blazed%20Brew%20Taunt:%20Rock,%20Paper,%20Scissors/65abf9fec46a2ca19f0fc110