https://backpack.tf/item/2222944307

Sale 1) Bulk sale

https://backpack.tf/profiles/76561198138664594#!/compare/1604275200/1604361600

https://backpack.tf/item/2525956275

Sale 2) ?

https://backpack.tf/profiles/76561198072208092#!/compare/1604707200/1604966400

https://backpack.tf/profiles/76561198815194876#!/compare/1604707200/1604966400

https://backpack.tf/item/4376444023

Sale 3) Sold for 10 Keys + a Name Tag

https://backpack.tf/profiles/76561198225796692#!/compare/1602633600/1602979200

Excluding because the buyer resold for much less in Sale 4

Sale 4) Sold + 5 Keys for a Disco Beat Down Full Metal Drill Hat

https://backpack.tf/profiles/76561199014827269#!/compare/1606435200/1606608000

Excluding because of the same rationale as Sale 3

Sale 5) Sold for 9 Keys

https://backpack.tf/profiles/76561199014827269#!/compare/1607990400/1608076800

https://backpack.tf/item/6236013004

Sale 6) Bulk sale

https://backpack.tf/profiles/76561198073176682#!/compare/1609200000/1609286400

https://backpack.tf/item/7941460715

Sale 7) Sold for 7 Keys to a buy order

https://backpack.tf/profiles/76561198353940070#!/compare/1605225600/1607817600

https://backpack.tf/item/2238885059

Sale 8) Not Unusual

https://backpack.tf/profiles/76561198358932637#!/compare/1602115200/1602201600

Sale 9) Quicksold for 6 Keys + 23 Refined

https://backpack.tf/profiles/76561198312007577#!/compare/1602115200/1602288000

https://backpack.tf/item/3585765813

Sale 10) ?

https://backpack.tf/profiles/76561198453530349#!/compare/1602374400/1602460800

https://backpack.tf/profiles/76561198057113717#!/compare/1602460800/1602547200

https://backpack.tf/item/4442599466

Sale 11) ?

https://backpack.tf/profiles/76561198074325951#!/compare/1602028800/1602201600

https://backpack.tf/profiles/76561198019257028#!/compare/1602201600/1602288000

https://backpack.tf/item/4774352476

Sale 12) Not Unusual

https://backpack.tf/profiles/76561199085116273#!/compare/1602460800/1602547200

Sale 13) ?

https://backpack.tf/profiles/76561198028203479#!/compare/1602547200/1602633600

https://backpack.tf/profiles/76561198338027163#!/compare/1602201600/1602633600

https://marketplace.tf/items/tf2/1015;5;u3045 - Sold for $30 (high), $8.10 (low), $18 x2, and $19.90 x2

Keys were ~$1.88 each for both $18 sales, ~$1.83 each for the first $19.90 sale, and ~$1.81 for the second

18 / 1.88 = 9.57, which rounds to 9.5 Keys

19.9 / 1.83 = 10.87, which rounds to 11 Keys

19.9 / 1.81 = 11 Keys

https://backpack.tf/item/4436402024 - Wasn't Unusual when it sold