Sale 1:

https://backpack.tf/profiles/76561198256998558#!/compare/1588032000/1588118400

https://backpack.tf/profiles/76561198128999327#!/compare/1588032000/1588464000

Untrace

sale 2:

https://backpack.tf/profiles/76561198317418604#!/compare/1584662400/1584835200

https://backpack.tf/profiles/76561199003570292#!/compare/1584316800/1584835200

https://backpack.tf/profiles/76561198317418604#!/compare/1584662400/1584835200

tradeback

sale 3:

https://backpack.tf/profiles/76561198199105413#!/compare/1548288000/1585094400

https://backpack.tf/profiles/76561198069493147#!/compare/1585008000/1585094400

QS for keys

sale 4:

https://backpack.tf/profiles/76561198069493147#!/compare/1585180800/1585267200

https://backpack.tf/profiles/76561198069410757#!/compare/1585180800/1585267200

Sold for CTFL Billy + 2 keys

Billy Mini:

https://backpack.tf/suggestion/5ec3866e4627321d530202c5

Suggestion for 13.5 keys

Total is 15.5 keys

sale 5:

https://backpack.tf/profiles/76561198069410757#!/compare/1585180800/1585267200

https://backpack.tf/profiles/76561198152434713#!/compare/1585267200/1585353600

Bulk

sale 6:

https://backpack.tf/profiles/76561198152434713#!/compare/1585267200/1585353600

https://backpack.tf/profiles/76561198280667527#!/compare/1585094400/1585353600

Sold with 5 keys for DP Rotation

use there

Sale 7:

https://backpack.tf/profiles/76561198280667527#!/compare/1585094400/1585353600

https://backpack.tf/profiles/76561198871136698#!/compare/1585267200/1585353600

Sold for ~13 keys

sale 8:

https://backpack.tf/profiles/76561198871136698#!/compare/1585353600/1585440000

https://backpack.tf/profiles/76561198125702540#!/compare/1585267200/1585353600

Sold for 14 keys

sale 9:

https://backpack.tf/profiles/76561198125702540#!/compare/1587513600/1587600000

https://backpack.tf/profiles/76561198051814654#!/compare/1587513600/1587600000

Sold for ~11 keys in sweets

sale 10:

https://marketplace.tf/items/tf2/701;5;u29

$20 / $1.82 = 10.99 keys

$34.99 / $1.82 = 19.23 keys

Total sales @:

11, 11, 13, 14, 16, 19 keys

buyers up to ~12 keys,

calling 19 high,

11 low,

taking 13 - 16 keys.