Sale 1:

https://backpack.tf/profiles/76561198931837142#!/compare/1561766400/1561852800

https://backpack.tf/profiles/76561198334598690#!/compare/1561766400/1561852800

QS

Sale 2:

https://backpack.tf/profiles/76561198334598690#!/compare/1562284800/1562371200

https://backpack.tf/profiles/76561198135427480#!/compare/1557705600/1563321600

Untrace

Sale 3:

https://backpack.tf/profiles/76561198432623475#!/compare/1565136000/1565740800

https://backpack.tf/profiles/76561198021272428#!/compare/1565136000/1565222400

Sold for Steaming Modest

use there

Sale 4:

https://backpack.tf/profiles/76561198021272428#!/compare/1565136000/1565222400

https://backpack.tf/profiles/76561198107354567#!/compare/1556064000/1565481600

SCM

Sale 5:

https://backpack.tf/profiles/76561198137066475#!/compare/1561075200/1561334400

https://backpack.tf/profiles/76561198034864943#!/compare/1561248000/1561334400

Bulky

Sale 6:

https://backpack.tf/profiles/76561198088171813#!/compare/1565654400/1565740800

https://backpack.tf/profiles/76561198055058172#!/compare/1565654400/1565740800

Sold for Stormy Juju(13) + 2 keys

Total is 15 keys

Sale 7:

https://backpack.tf/profiles/76561198055058172#!/compare/1565740800/1565827200

https://backpack.tf/profiles/76561198170045102#!/compare/1565740800/1565827200

Sold with 2 keys for Stormy Blast(15)

Total is 13 keys

Sale 8:

https://backpack.tf/profiles/76561198170045102#!/compare/1565913600/1566000000

https://backpack.tf/profiles/76561198064589227#!/compare/1565913600/1566000000

https://backpack.tf/profiles/76561198418740133#!/compare/1565913600/1566000000

Bulk

Sale 9:

https://backpack.tf/profiles/76561198055099506#!/compare/1562976000/1563062400

https://backpack.tf/profiles/76561198895213010#!/compare/1562889600/1562976000

Sold for DBD Sky High

Sky High Mini:

https://backpack.tf/suggestion/5d71f0af6780720f3826e4ea

Suggestion for 13 keys

Sale 10:

https://backpack.tf/profiles/76561198895213010#!/compare/1562889600/1562976000

https://backpack.tf/profiles/76561198334598690#!/compare/1563062400/1563148800

QS / untrace

Sale 11, 12:

https://marketplace.tf/items/tf2/30357;5;u32

$39.99 / $1.85 = 21.62 keys

$25.95 / $1.83 = 14.18 keys

Total sales @:

13, 13, 14, 15, 22 keys

excluding 22 as a high outlier,

taking 13 - 15 keys