Sale 1-2:

https://marketplace.tf/items/tf2/30422;5;u34

$31.1 / $1.78 = 17.47 keys // https://backpack.tf/item/7605013063

$19.28 / $1.68 = 11.48 keys // https://backpack.tf/item/6569775933

Sale 3:

untrace

https://backpack.tf/profiles/76561198129748267#!/compare/1581811200/1586908800

https://backpack.tf/profiles/76561198043936328#!/compare/1584835200/1584921600

Sale 4:

16 keys

https://backpack.tf/profiles/76561198341171690#!/compare/1581897600/1581984000

https://backpack.tf/profiles/76561198257523483#!/compare/1579651200/1582416000

Sale 5:

15 keys

https://backpack.tf/profiles/76561198341171690#!/compare/1584921600/1585008000

https://backpack.tf/profiles/76561198892084729#!/compare/1584921600/1585008000

Sale 6:

14 keys

https://backpack.tf/profiles/76561198892084729#!/compare/1585008000/1585094400

https://backpack.tf/profiles/76561198131081286#!/compare/1585008000/1585094400

Sale 7:

16 keys

sold with 2 keys for max head(18)

https://backpack.tf/profiles/76561198131081286#!/compare/1585094400/1585180800

https://backpack.tf/profiles/76561198402039752#!/compare/1585094400/1585180800

Sale 8:

better used on high five

sold with 5 keys for Arctic high five

https://backpack.tf/profiles/76561198402039752#!/compare/1585180800/1585267200

https://backpack.tf/profiles/76561198156407608#!/compare/1585180800/1585267200

Sale 9:

use there

miami bonk helm

https://backpack.tf/profiles/76561198156407608#!/compare/1585180800/1585267200

https://backpack.tf/profiles/76561198085685517#!/compare/1585180800/1585267200

Sale 10:

bulk

https://backpack.tf/profiles/76561198085685517#!/compare/1585267200/1585353600

https://backpack.tf/profiles/76561198972294135#!/compare/1585267200/1585353600

Sale 11:

untrace

https://backpack.tf/profiles/76561198972294135#!/compare/1585267200/1585353600

https://backpack.tf/profiles/76561198309261884#!/compare/1585353600/1585440000

Sale 12:

Circling TF Logo Field Practice(19.5)

https://backpack.tf/profiles/76561198309261884#!/compare/1585353600/1585440000

https://backpack.tf/profiles/76561198208710383#!/compare/1585440000/1585526400

Field Practice: https://backpack.tf/suggestion/5e988830ed9f71348245ccbc

Sale 13:

steaming towering pillar(15)

https://backpack.tf/profiles/76561198208710383#!/compare/1585440000/1585526400

https://backpack.tf/profiles/76561198000485231#!/compare/1585440000/1585526400

pillar: https://backpack.tf/suggestion/5e98c4f391ee644f1e3bb93a

Sale 14:

untrace

https://backpack.tf/profiles/76561198000485231#!/compare/1585612800/1585699200

https://backpack.tf/profiles/76561198056974324#!/compare/1585526400/1585612800

Sale 15:

bulk

https://backpack.tf/profiles/76561198056974324#!/compare/1585958400/1586044800

https://backpack.tf/profiles/76561198031743044#!/compare/1585958400/1586044800

==============================================================================

Sales:

11,14,15,15,16,16,17,20

buyers at 14 keys: https://imgur.com/a/NDvYZGY

20 high outlier