Taking last two months, from October 14

https://marketplace.tf/items/tf2/31085;5;u144

Oct 17 - $59.39 / $1.87 = 31.76 keys

Oct 30 - $50.46 / $1.82 = 27.73 keys

Nov 4 - $50.46 / $1.80 = 28.03 keys

Nov 7 - $50.46 / $1.81 = 27.88 keys

Nov 12 - $45.79 / $1.78 = 25.72 keys

Nov 15 - $59.99 / $1.76 = 34.09 keys

Nov 25 - $69.96 / $1.76 = 39.75 keys

Dec 10 - $59.99 / $1.82 = 32.96 keys

https://backpack.tf/item/9112630013

https://backpack.tf/item/8917402900

https://backpack.tf/item/8604435836

https://backpack.tf/item/8367572184

https://backpack.tf/profiles/76561198152934692#!/compare/1606694400/1607385600

https://backpack.tf/profiles/76561199100748551#!/compare/1607385600/1607472000

21 keys and refined

https://backpack.tf/profiles/76561198056681334#!/compare/1601078400/1601251200

https://backpack.tf/profiles/76561198195933333#!/compare/1601164800/1601251200

Untraceable

https://backpack.tf/profiles/76561198195933333#!/compare/1603670400/1603756800

https://backpack.tf/profiles/76561198161403931#!/compare/1601337600/1603756800

Untraceable

https://backpack.tf/profiles/76561198161403931#!/compare/1601337600/1603756800

https://backpack.tf/profiles/76561197963500354#!/compare/1603670400/1603756800

23 keys

https://backpack.tf/profiles/76561197963500354#!/compare/1603670400/1603756800

https://backpack.tf/profiles/76561198871274110#!/compare/1603843200/1604188800

Untraceable but looks like the October 30 Marketplace sale

https://backpack.tf/profiles/76561198032835073#!/compare/1607212800/1607299200

https://backpack.tf/profiles/76561199100585966#!/compare/1607212800/1607299200

23 keys

https://backpack.tf/profiles/76561198139111928#!/compare/1604016000/1604188800

https://backpack.tf/profiles/76561198337734785#!/compare/1603929600/1604016000

Untraceable

https://backpack.tf/profiles/76561198337734785#!/compare/1604620800/1604707200

https://backpack.tf/profiles/76561198338101511#!/compare/1602288000/1605484800

Untraceable

https://backpack.tf/profiles/76561198338101511#!/compare/1606003200/1606262400

https://backpack.tf/profiles/76561198098218976#!/compare/1605916800/1606435200

Untraceable

https://backpack.tf/profiles/76561198067903831#!/compare/1602720000/1602806400

https://backpack.tf/profiles/76561198831596900#!/compare/1602720000/1602806400

29 keys

https://backpack.tf/profiles/76561198831596900#!/compare/1603065600/1603152000

https://backpack.tf/profiles/76561198205939253#!/compare/1603065600/1603152000

Added for Frozen Icefall Heph Headcraft

https://backpack.tf/profiles/76561198205939253#!/compare/1603238400/1603324800

https://backpack.tf/profiles/76561198087175689#!/compare/1603238400/1603324800

16 keys matches

https://backpack.tf/profiles/76561198087175689#!/compare/1603411200/1603497600

https://backpack.tf/profiles/76561198321589939#!/compare/1603411200/1603497600

Green Energy Carouser's Capotain (22.5 keys) + 4 keys = 26.5 keys

https://backpack.tf/suggestion/5fd80acb56f0a1680831d0b6

https://backpack.tf/profiles/76561198321589939#!/compare/1603584000/1603670400

https://backpack.tf/profiles/76561198074560443#!/compare/1603584000/1603670400

Clairvoyance Vampire Vanquisher

Toxic Terrors Taunt: Fresh Brewed Victory

This sale ends around ~23 keys, based off Vampire sellers (18) and Brewed Victory Mp sales (3-5)

https://marketplace.tf/items/tf2/1113;5;u3046

https://backpack.tf/profiles/76561198074560443#!/compare/1603756800/1603843200

https://backpack.tf/profiles/76561198271789356#!/compare/1603670400/1603843200

Untraceable

Sales:

21

23

23

23

26

26.5

28

29

32

33

34

40

23 went to bots and one low MP sale

https://gyazo.com/ffd6354dbf50a0505ba4a7db86a0c9d8

sellers at 28 and 29, about 1 and 2 weeks old each

lets go 26-29