Sale 1:

https://backpack.tf/profiles/76561198357878467#!/compare/1564963200/1569369600

https://backpack.tf/profiles/76561198395649047#!/compare/1567209600/1568505600

Untrace

sale 2:

https://backpack.tf/profiles/76561198042587081#!/compare/1566432000/1568505600

https://backpack.tf/profiles/76561198080179568#!/compare/1566345600/1566432000

QS

sale 3:

https://backpack.tf/profiles/76561198080179568#!/compare/1567382400/1567468800

https://backpack.tf/profiles/76561198248995144#!/compare/1567123200/1567728000

Sold for 8 keys

Sale 4:

https://backpack.tf/profiles/76561198248995144#!/compare/1567728000/1568678400

https://backpack.tf/profiles/76561198080179568#!/compare/1568419200/1568505600

QS

Sale 5:

https://backpack.tf/profiles/76561198113899098#!/compare/1564099200/1564185600

https://backpack.tf/profiles/76561198027526890#!/compare/1564012800/1564444800

Sold for 10 keys

sale 6:

https://backpack.tf/profiles/76561198081220016#!/compare/1563494400/1563580800

https://backpack.tf/profiles/76561198075815619#!/compare/1563494400/1563580800

Untrace

sale 7:

https://backpack.tf/profiles/76561198075815619#!/compare/1563580800/1563667200

https://backpack.tf/profiles/76561198091342225#!/compare/1563580800/1563667200'

https://backpack.tf/profiles/76561198194358278#!/compare/1563494400/1563580800

Untrace

Sale 8:

https://backpack.tf/profiles/76561198194358278#!/compare/1563580800/1563667200

https://backpack.tf/profiles/76561198843408300#!/compare/1563580800/1563667200

Keys

Sale 9:

https://backpack.tf/profiles/76561197991103934#!/compare/1564790400/1567123200

https://backpack.tf/profiles/76561198849008100#!/compare/1565913600/1566000000

SCM

Sale 10:

https://backpack.tf/profiles/76561198849008100#!/compare/1566000000/1566086400

https://backpack.tf/profiles/76561198113899098#!/compare/1566691200/1566777600

SCM

Sale 11:

https://backpack.tf/profiles/76561198076525851#!/compare/1562716800/1562976000

https://backpack.tf/profiles/76561197978500506#!/compare/1562889600/1562976000

Untrace

sale 12:

https://backpack.tf/profiles/76561197978500506#!/compare/1564099200/1564185600

https://backpack.tf/profiles/76561198149214434#!/compare/1553299200/1564185600

Sold for 9 keys

sale 13:

https://backpack.tf/profiles/76561198149214434#!/compare/1564272000/1564358400

https://backpack.tf/profiles/76561198087359163#!/compare/1563408000/1564531200

Sold for 9 keys

Sale 14:

https://backpack.tf/profiles/76561198087359163#!/compare/1566432000/1566691200

https://backpack.tf/profiles/76561198874815681#!/compare/1566604800/1566691200

untrace

Sale 15:

https://backpack.tf/profiles/76561198874815681#!/compare/1566691200/1566777600

https://backpack.tf/profiles/76561198068460782#!/compare/1566604800/1566691200

Sold for Aces Polar Bear

use there

Sale 16:

https://backpack.tf/profiles/76561198068460782#!/compare/1566604800/1566691200

https://backpack.tf/profiles/76561198272049199#!/compare/1566604800/1566691200

Sold for Aces Pure Tin + negligible sweets

use there

Sale 17:

https://backpack.tf/profiles/76561198272049199#!/compare/1566604800/1566691200

https://backpack.tf/profiles/76561198069493147#!/compare/1566604800/1566691200

QS

Sale 18:

https://backpack.tf/profiles/76561198069493147#!/compare/1566864000/1566950400

https://backpack.tf/profiles/76561198405682760#!/compare/1566864000/1566950400

Sold for 7 keys

sale 19 - 21:

https://marketplace.tf/items/tf2/330;5;u61

$17.99 / $1.84 = 9.78 keys

$15.11 / $1.82 = 8.30 keys <-- https://backpack.tf/item/3841020749

$17.99 / $1.82 = 9.88 keys

Total sales @:

7, 8, 8.3, 9, 9, 9.78, 9.88, 10 keys

Buyers up to ~5.5 keys,

sellers down to 9 keys,

gonna conserve around unsolds,

taking 8 - 10 keys