Taking from November 1

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https://marketplace.tf/items/tf2/31058;5;u127

Nov 3 - $80, very high looking at current sellers

Nov 26 - $51 = 29 keys

Dec 4 - $40.26 = 24 keys

Dec 7 - $36 x2 = 21 keys x2

Dec 12 - $35.01 (Buy order), $42.45 = 25 keys

https://backpack.tf/item/8277452813

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https://backpack.tf/profiles/76561198043884846#!/compare/1574726400/1575331200

https://backpack.tf/profiles/76561198112542696#!/compare/1574726400/1574812800

This is the November 26 Marketplace sale.

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https://backpack.tf/profiles/76561198868951706#!/compare/1575504000/1575590400

https://backpack.tf/profiles/76561198218095591#!/compare/1575504000/1575590400

seems to be 18.5 keys

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https://backpack.tf/profiles/76561198080795827#!/compare/1575676800/1575763200

https://backpack.tf/profiles/76561198218095591#!/compare/1575676800/1575763200

TW COTOK + 3 keys (The COTOK needs a heavy drop)

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https://backpack.tf/profiles/76561198018101085#!/compare/1575590400/1575676800

https://backpack.tf/profiles/76561198326254870#!/compare/1575590400/1575676800

Seems to be a quicksell

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https://backpack.tf/profiles/76561198271943742#!/compare/1572566400/1572998400

https://backpack.tf/profiles/76561198130593148#!/compare/1572393600/1573171200

Untraceable SCM sale

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https://backpack.tf/profiles/76561198130593148#!/compare/1574208000/1576454400

https://backpack.tf/profiles/76561198043936328#!/compare/1574121600/1574208000

Untraceable

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https://backpack.tf/profiles/76561198861407846#!/compare/1576281600/1576368000

https://backpack.tf/profiles/76561198357554798#!/compare/1576281600/1576368000

Untraceable

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https://backpack.tf/profiles/76561198375935102#!/compare/1576368000/1576972800

https://backpack.tf/profiles/76561198861407846#!/compare/1576368000/1576972800

Untraceable

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https://backpack.tf/profiles/76561198192773773#!/compare/1576972800/1577059200

https://backpack.tf/profiles/76561198089263438#!/compare/1576713600/1576972800

Haunted Ghosts Coldsnap Cap (39 keys)

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https://backpack.tf/profiles/76561198271943742#!/compare/1572566400/1572998400

https://backpack.tf/profiles/76561198271943742#!/compare/1572566400/1572998400

Untraceable SCM sale

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https://backpack.tf/profiles/76561198130593148#!/compare/1574208000/1576454400

https://backpack.tf/profiles/76561198043936328#!/compare/1574121600/1574208000

Untraceable

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https://backpack.tf/profiles/76561198027192301#!/compare/1572480000/1573430400

https://backpack.tf/profiles/76561198041186431#!/compare/1572652800/1572739200

Untraceable

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https://backpack.tf/item/8156844406

nothing usable

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https://backpack.tf/profiles/76561198255119379#!/compare/1573862400/1574640000

https://backpack.tf/profiles/76561198303138234#!/compare/1574553600/1574640000

Using there

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https://backpack.tf/profiles/76561198112281935#!/compare/1574640000/1574726400

https://backpack.tf/profiles/76561198255119379#!/compare/1574640000/1574726400

https://backpack.tf/item/8161693480

Untraceable SCM sale

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https://backpack.tf/profiles/76561198066678769#!/compare/1572652800/1572739200

https://backpack.tf/profiles/76561198287676092#!/compare/1572652800/1572739200

Untraceable

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https://backpack.tf/profiles/76561198287676092#!/compare/1573257600/1573344000

https://backpack.tf/profiles/76561198146826335#!/compare/1573084800/1573257600

14 keys

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https://backpack.tf/profiles/76561198197292179#!/compare/1573603200/1573689600

https://backpack.tf/profiles/76561198146826335#!/compare/1573603200/1573689600

Untraceable

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https://backpack.tf/profiles/76561198308347465#!/compare/1573603200/1574035200

https://backpack.tf/profiles/76561198258459717#!/compare/1573257600/1573776000

Nether Void Skating Scorcher, very low

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https://backpack.tf/profiles/76561198308347465#!/compare/1575763200/1575849600

https://backpack.tf/profiles/76561198869506063#!/compare/1575763200/1575849600

Better used on the Gauzed Gaze

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https://backpack.tf/profiles/76561198044925142#!/compare/1575504000/1575849600

https://backpack.tf/profiles/76561198869506063#!/compare/1575849600/1575936000

Not bulk, but better used on the Aces High Rack

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https://backpack.tf/profiles/76561198044925142#!/compare/1575936000/1576022400

https://backpack.tf/profiles/76561198284124072#!/compare/1575849600/1576022400

Better used on Ooze Defiant Spartan

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https://backpack.tf/profiles/76561198284124072#!/compare/1576281600/1576972800

https://backpack.tf/profiles/76561198199313686#!/compare/1576972800/1577059200

15 keys + fountain of delight victory lap, then the victory lap was quicksold same day

so in the end, the seller (compare link 1) received 28.5 keys.

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sales

21

21

24

25

29

29

39

sellers:

https://gyazo.com/fd07447a8f21a5446e34dda62d2bcbd8

not much success from 34 keys and over

https://gyazo.com/9d75e0220f996a6557d86c4af00ef20e

6 sellers on marketplace from 37-38 keys / $66-67

buyesr at 22

lets go with 24-29 keys