Team Galactic

https://backpack.tf/item/602445930

Sale 1) Bulk sale

https://backpack.tf/profiles/76561198021272428#!/compare/1541721600/1541808000

https://backpack.tf/profiles/76561198275742101#!/compare/1541808000/1541894400

Sale 2) Sold + ~2.5 Keys of Items for a Smoking Conjurer's Cowl (13.5 Keys)

https://backpack.tf/profiles/76561198275742101#!/compare/1542931200/1543104000

https://backpack.tf/profiles/76561198002757046#!/compare/1543017600/1543104000

13.5 - 2.5 = 11 Keys

Cowl Mini

https://backpack.tf/suggestion/5c43c25c44325a393838dbad - 13.5 Keys

Sale 3) Sold for 9 Keys

https://backpack.tf/profiles/76561198002757046#!/compare/1543276800/1543363200

https://backpack.tf/profiles/76561198259452748#!/compare/1542758400/1543795200

https://backpack.tf/item/1400925403

Sale 4) ?

https://backpack.tf/profiles/76561198126953769#!/compare/1545436800/1546128000

https://backpack.tf/profiles/76561198045775820#!/compare/1545350400/1545609600

Sale 5) ?

https://backpack.tf/profiles/76561198045775820#!/compare/1546041600/1546128000

https://backpack.tf/profiles/76561198315567455#!/compare/1542844800/1547596800

Sale 6) ?

https://backpack.tf/profiles/76561198315567455#!/compare/1547596800/1547683200

https://backpack.tf/item/815031916

Sale 7) Sold for 9 Keys

https://backpack.tf/profiles/76561198101603592#!/compare/1547251200/1547424000

https://backpack.tf/profiles/76561198341171690#!/compare/1547337600/1547424000 - I counted 9 from here

https://backpack.tf/profiles/76561198024867201#!/compare/1547337600/1547424000 - The 9 Keys the Taunt sold for match.

https://marketplace.tf/items/388;5;u32;strange - Sold for $24.99 when Keys were ~$1.77 each

https://marketplace.tf/items/5021;6/Mann%20Co.%20Supply%20Crate%20Key

24.99 / 1.77 = 14.11, which rounds to 14 Keys

https://imgur.com/a/9ibNhzV - 3 Day Seller at 12 Keys.

2 Day/10 Day Buyers at 9.61 Keys, 7 Day Buyer at 9.49 Keys, 6 Day Buyer at 9.14 Keys, and an 8 Month Buyer at 9.09 Keys.

https://backpack.tf/item/815031916 - Seller

https://backpack.tf/u/76561198155110999

https://backpack.tf/u/76561198048851745

https://backpack.tf/u/76561198358778649

https://backpack.tf/u/76561198382290208

https://backpack.tf/u/76561198011321852