Sale 1:

https://backpack.tf/profiles/76561198303494235#!/compare/1561593600/1562112000

https://backpack.tf/profiles/76561198337734785#!/compare/1562025600/1562112000

QS

Sale 2:

https://backpack.tf/profiles/76561198884449271#!/compare/1565913600/1566000000

https://backpack.tf/profiles/76561198133616658#!/compare/1565913600/1566000000

Sold for KaW Fr-0 + 3 keys

use there

Sale 3:

https://backpack.tf/profiles/76561198133616658#!/compare/1566000000/1566000000/nearest

https://backpack.tf/profiles/76561198021055079#!/compare/1566000000/1566086400

Sold with 6 keys for Stormy Hermes(13)

Total is 8 keys

Sale 4:

https://backpack.tf/profiles/76561198053650453#!/compare/1565913600/1566086400

https://backpack.tf/profiles/76561198026129220#!/compare/1565827200/1565913600

QS

Sale 5:

https://backpack.tf/profiles/76561198953698521#!/compare/1566259200/1566518400

https://backpack.tf/profiles/76561198195888437#!/compare/1566432000/1566518400

Untrace

sale 6:

https://backpack.tf/profiles/76561198045209288#!/compare/1567123200/1567555200

https://backpack.tf/profiles/76561198422554075#!/compare/1567468800/1567555200

Sold for 9 keys

Sale 7:

https://backpack.tf/profiles/76561198422554075#!/compare/1567814400/1567900800

https://backpack.tf/profiles/76561198392520757#!/compare/1567814400/1568073600

QS

Sale 8:

https://backpack.tf/profiles/76561198392520757#!/compare/1568505600/1568592000

https://backpack.tf/profiles/76561198337734785#!/compare/1568419200/1568505600

QS

Sale 9:

https://backpack.tf/profiles/76561198362247685#!/compare/1566086400/1566432000

https://backpack.tf/profiles/76561198859701544#!/compare/1566000000/1566086400

Sold for ~7.5 keys

Sale 10:

https://backpack.tf/profiles/76561198859701544#!/compare/1566518400/1566604800

https://backpack.tf/profiles/76561198289695203#!/compare/1566432000/1566604800

Sold with 4 keys for C9 Heer

not using

sale 11:

https://backpack.tf/profiles/76561198289695203#!/compare/1566604800/1566691200

https://backpack.tf/profiles/76561198859701544#!/compare/1566604800/1566691200

tradeback...? not using Sale 10....

Sale 12, 13:

https://marketplace.tf/items/tf2/633;5;u59

$17.05 / $1.83 = 9.32 keys

$17.05 / $1.82 = 9.37 keys

Total sales @:

7.5, 8, 9, 9.32, 9.37 keys

buyers up to ~6 keys,

seller at 10 keys,

taking 7.5 - 9.5 keys