Sale 1:

https://backpack.tf/profiles/76561198013996603#!/compare/1568073600/1568160000

https://backpack.tf/profiles/76561198020224041#!/compare/1568246400/1568592000

Bulk

sale 2:

https://backpack.tf/profiles/76561198013285344#!/compare/1566777600/1567036800

https://backpack.tf/profiles/76561198340634356#!/compare/1566691200/1566777600

Untrace

Sale 3:

https://backpack.tf/profiles/76561198340634356#!/compare/1566691200/1566777600

https://backpack.tf/profiles/76561198290033158#!/compare/1566604800/1566777600

Sold for 17 keys

sale 4:

https://backpack.tf/profiles/76561198050930436#!/compare/1566777600/1566950400

https://backpack.tf/profiles/76561198407284982#!/compare/1569888000/1570147200

SCM

Sale 5:

https://backpack.tf/profiles/76561198143528696#!/compare/1567900800/1569801600

https://backpack.tf/profiles/76561198402124564#!/compare/1572480000/1572652800

SCM

sale 6:

https://backpack.tf/profiles/76561198091721210#!/compare/1570406400/1570492800

https://backpack.tf/profiles/76561198097271466#!/compare/1571356800/1571443200

QS

sale 7:

https://backpack.tf/profiles/76561198256468268#!/compare/1566604800/1566691200

https://backpack.tf/profiles/76561198050310748#!/compare/1566518400/1566604800

made unusual

sale 8:

https://backpack.tf/profiles/76561198301603439#!/compare/1572048000/1572134400

https://backpack.tf/profiles/76561198031126990#!/compare/1572048000/1572134400

Bulk

sale 9:

https://backpack.tf/profiles/76561198129117639#!/compare/1560211200/1570579200

https://backpack.tf/profiles/76561198332324050#!/compare/1569628800/1570579200

untrace

sale 10:

https://backpack.tf/profiles/76561198332324050#!/compare/1570579200/1570665600

https://backpack.tf/profiles/76561198412977005#!/compare/1569715200/1571529600

Untrace

sale 11:

https://backpack.tf/profiles/76561198412977005#!/compare/1571529600/1572048000

https://backpack.tf/profiles/76561198412785172#!/compare/1565913600/1573344000

Bulk

sale 12:

https://backpack.tf/profiles/76561198235159048#!/compare/1563148800/1568764800

https://backpack.tf/profiles/76561198044684270#!/compare/1568678400/1568764800

Untrace

Sale 13:

https://backpack.tf/profiles/76561198011321852#!/compare/1570838400/1570924800

https://backpack.tf/profiles/76561198120481786#!/compare/1570924800/1571270400

Sold for C9 Kiss King

use there

sale 14:

https://backpack.tf/profiles/76561198177485682#!/compare/1567123200/1567209600

https://backpack.tf/profiles/76561198003671763#!/compare/1566604800/1567123200

Untrace

sale 15:

https://backpack.tf/profiles/76561198003671763#!/compare/1566604800/1567123200

https://backpack.tf/profiles/76561198838468618#!/compare/1567036800/1567123200

sold for Max Head(~19)

Sale 16:

https://backpack.tf/profiles/76561198838468618#!/compare/1567036800/1567123200

https://backpack.tf/profiles/76561198340634356#!/compare/1567036800/1567123200

Untrace

sale 17:

https://backpack.tf/profiles/76561198340634356#!/compare/1569888000/1569974400

https://backpack.tf/profiles/76561198305676157#!/compare/1569974400/1570147200

QS

sale 18:

https://marketplace.tf/items/tf2/1162;5;u3003

$34.64 / $1.84 = 18.83 keys

$34.99 / $1.84 = 19.02 keys <--- https://backpack.tf/item/5015320525

$35.99 / $1.84 = 19.56 keys

Total sales @:

17, 19, 19, 19, 20 keys

buyers up to ~15 keys,

sellers down to 17 keys, unsold for 2 weeks +,

18 key seller unsold for 20 days,

lets call 20 high,

take 17 - 19 keys, conserving inside(?) the sellers...