Sale 1:

https://backpack.tf/profiles/76561198830746068#!/compare/1566777600/1566864000

https://backpack.tf/profiles/76561198389276433#!/compare/1566086400/1567382400

sold for 18 keys

Sale 2:

https://backpack.tf/profiles/76561198389276433#!/compare/1567382400/1568937600

https://backpack.tf/profiles/76561198306288794#!/compare/1568851200/1568937600

Bulk

Sale 3:

https://backpack.tf/profiles/76561198174890191#!/compare/1568332800/1568419200

https://backpack.tf/profiles/76561198325261992#!/compare/1568332800/1568419200

untrace

Sale 4:

https://backpack.tf/profiles/76561198325261992#!/compare/1568419200/1568505600

https://backpack.tf/profiles/76561198036117309#!/compare/1568419200/1568505600

Sold with 2 keys for TW Impaler

use there

sale 5:

https://backpack.tf/profiles/76561198036117309#!/compare/1568419200/1568505600

https://backpack.tf/profiles/76561198121698432#!/compare/1568419200/1568505600

Sold for ~13 keys

sale 6:

https://backpack.tf/profiles/76561198121698432#!/compare/1568505600/1568592000

https://backpack.tf/profiles/76561198211983245#!/compare/1568419200/1568592000

Sold for keys

sale 7:

https://backpack.tf/profiles/76561198211983245#!/compare/1568592000/1568678400

https://backpack.tf/profiles/76561198038142758#!/compare/1568678400/1568764800

Sold for Miami Fez

use there

Sale 8:

https://backpack.tf/profiles/76561198038142758#!/compare/1569888000/1570060800

https://backpack.tf/profiles/76561198101500272#!/compare/1569974400/1570060800

Sold for ~17 keys

Sale 9, 10:

https://marketplace.tf/items/tf2/319;5;u18

$35.99 / $1.83 = 19.67 keys

$21.18 / $1.82 = 11.64 keys

Total sales @:

11.64, 13, 17, 18, 19.64 keys

buyers up to 12 keys,

sellers down to 18 keys, unsold for months,

taking 13 - 18 keys