Sale 1:

https://backpack.tf/profiles/76561198154593997#!/compare/1563926400/1564099200

https://backpack.tf/profiles/76561198299237697#!/compare/1563840000/1564099200

SCM

Sale 2:

https://backpack.tf/profiles/76561198299237697#!/compare/1567209600/1567296000

https://backpack.tf/profiles/76561198317418604#!/compare/1567209600/1567296000

QS

sale 3:

https://backpack.tf/profiles/76561198053956709#!/compare/1567296000/1568505600

https://backpack.tf/profiles/76561198245971154#!/compare/1567036800/1568419200

Untrace

Sale 4:

https://backpack.tf/profiles/76561198160966355#!/compare/1566000000/1568505600

https://backpack.tf/profiles/76561198970367300#!/compare/1565913600/1566172800

SCM

Sale 5:

https://backpack.tf/profiles/76561198388444586#!/compare/1566000000/1566432000

https://backpack.tf/profiles/76561198101300189#!/compare/1565913600/1566000000

https://backpack.tf/profiles/76561198205939253#!/compare/1565913600/1566000000

https://backpack.tf/profiles/76561198051356793#!/compare/1566000000/1566777600

Untrace

Sale 6:

https://backpack.tf/profiles/76561198059354111#!/compare/1568160000/1568246400

https://backpack.tf/profiles/76561198114635132#!/compare/1568160000/1568246400

Sold for Aces Coldsnap

Hat is unstable, sellers way below sales.

https://pastebin.com/v3QeyDBP

Sale 7:

https://backpack.tf/profiles/76561198043436466#!/compare/1567209600/1567296000

https://backpack.tf/profiles/76561198358482558#!/compare/1567209600/1567296000

Sold for 14 keys

Sale 8 - 11:

https://marketplace.tf/items/tf2/817;5;u61

$49.5 / $1.82 = 27.20 keys <-- https://backpack.tf/item/2173800787

$44.44 / $1.81 = 24.55 keys <-- https://backpack.tf/item/1967844917

$37.73 / $1.82 = 20.73 keys <--https://backpack.tf/item/7957611247 or other sale

$14.74 / $1.82 = 8.10 keys <---- ^

Sale 12:

https://backpack.tf/profiles/76561198142482594#!/compare/1559606400/1564099200

https://backpack.tf/profiles/76561198154593997#!/compare/1563494400/1563753600

Sold for Steaming Coldsnap

Coldsnap Mini:

https://backpack.tf/suggestion/5d7dc848d381727bde6dc9af

Suggestion for 20 keys

Total sales @:

8.10, 14, 20, 20.73, 24.55, 27.20 keys

buyers up to 13 keys,

sellers at 23 keys,

both aging.

calling >14 and 27 outliers,

gonna take 20 - 25 keys, conserve close to sellers.