https://backpack.tf/item/4356411379

12 keys:

https://backpack.tf/profiles/76561199192607141#!/compare/1705622400/1705708800

https://backpack.tf/profiles/76561198097102281#!/compare/1705622400/1705708800

https://backpack.tf/item/12436627004

https://marketplace.tf/items/tf2/30672;5;u3113

November 27: $24.99/1.723=14.5 ~15 keys

key price https://marketplace.tf/items/tf2/5021;6

(1.71+1.71+1.71+1.71+1.77+1.73+1.72)/7=1.723

https://steamcommunity.com/market/listings/440/Unusual%20Taunt%3A%20Zoomin%27%20Broom?filter=Boundless+Blizzard

https://imgur.com/l2X4DM7

seller at $24.98 (~12 keys taking keys as $2.09)

2 sellers at ~14.7 keys on MPTF too

Going with 12 flat since 15 looks a bit high

https://backpack.tf/item/9638663848

Quicksell.Store dump:

https://backpack.tf/profiles/76561198044425376#!/compare/1701561600/1708300800

https://backpack.tf/profiles/76561199059698603#!/compare/1701475200/1701561600

Untrace (yes I checked the keys in buyer's compare):

https://backpack.tf/profiles/76561199059698603#!/compare/1707955200/1708041600

https://backpack.tf/profiles/76561198194078077#!/compare/1707955200/1708041600

https://backpack.tf/item/5373078097

12 keys:

https://backpack.tf/profiles/76561199315621199#!/compare/1703721600/1703808000

https://backpack.tf/profiles/76561198202477528#!/compare/1703203200/1703808000

All the tradebacks between OJ and ZaGii are most likely gambling, it then went on Mannco.store

https://steamcommunity.com/market/listings/440/Unusual%20Taunt%3A%20Zoomin%27%20Broom?filter=Boundless+Blizzard Seller at $24.88 (~11,41 keys)

I'll keep an eye on the SCM seller for now