Sale 1:

https://marketplace.tf/items/378;5;u34

$89.99 / $1.8 = 49.99 keys [ Excluding as high outlier ]

Sale 2:

33 keys

Sold with Stormy Officer's Ushanka(15.5) for Vivid Mining Light (48)

https://backpack.tf/profiles/76561198066586338#!/compare/1540857600/1541116800

https://backpack.tf/profiles/76561198045174236#!/compare/1541116800/1541203200

Ushanka mini: https://backpack.tf/suggestion/5c31101544325a183a40d182

Mining light mini: https://backpack.tf/suggestion/5c3122f8cf6c756aa20c7d1a

Sale 3:

40 keys

Sold for Aussie Eyelander(32.56) + 4 pure + 3 keys sweets

https://backpack.tf/profiles/76561198045174236#!/compare/1543104000/1543190400

https://backpack.tf/profiles/76561198232697088#!/compare/1543104000/1543190400

Eyelander: https://imgur.com/a/EhjRnnB

Sale 4:

Better used there

Sold with 2 keys for Ominous Mannrobics

https://backpack.tf/profiles/76561198232697088#!/compare/1543708800/1543795200

https://backpack.tf/profiles/76561198021055079#!/compare/1543708800/1543795200

Sale 5:

33 keys

Sold for Spec KS Aussie Tomislav(16) + 17 pure

https://backpack.tf/profiles/76561198021055079#!/compare/1544227200/1544313600

https://backpack.tf/profiles/76561198134712257#!/compare/1544227200/1544313600

Tomislav: https://imgur.com/a/2PWkEkQ

Sale 6:

28 pure [ Excluding as 1 key off buyers: https://imgur.com/a/nh5ThWU ]

https://backpack.tf/profiles/76561198002391950#!/compare/1545091200/1545177600

https://backpack.tf/profiles/76561198208914563#!/compare/1545091200/1545177600

Sale 7:

8 pure low- excluding

https://backpack.tf/profiles/76561198208914563#!/compare/1545264000/1545350400

https://backpack.tf/profiles/76561198162278572#!/compare/1545264000/1545350400

Sale 8:

Bulk

https://backpack.tf/profiles/76561198162278572#!/compare/1545350400/1545436800

https://backpack.tf/profiles/76561198068732040#!/compare/1545350400/1545436800

Sale 9:

Marketplace sale

https://backpack.tf/profiles/76561198068732040#!/compare/1545609600/1545696000

https://backpack.tf/profiles/76561198046985101#!/compare/1543449600/1545782400