Sale 1:

https://backpack.tf/profiles/76561198858678419#!/compare/1564185600/1565913600

https://backpack.tf/profiles/76561198043663101#!/compare/1566950400/1566950400

Untrace

Sale 2:

https://backpack.tf/profiles/76561198005141580#!/compare/1564012800/1564099200

https://backpack.tf/profiles/76561198251704884#!/compare/1564012800/1564099200

Sold for Spell

Sale 3:

https://backpack.tf/profiles/76561198337734785#!/compare/1560902400/1560988800

https://backpack.tf/profiles/76561198081361662#!/compare/1560902400/1560988800

Sold for 10 keys (Geezer is part of separate sale)

Sale 4:

https://backpack.tf/profiles/76561198081361662#!/compare/1560988800/1561075200

https://backpack.tf/profiles/76561198131148043#!/compare/1560988800/1561075200

Sold for ~8.5 keys

Sale 5:

https://backpack.tf/profiles/76561198131148043#!/compare/1561075200/1561161600

https://backpack.tf/profiles/76561198389689295#!/compare/1561075200/1561161600

Sold for 9 keys

Sale 6:

https://backpack.tf/profiles/76561198389689295#!/compare/1561161600/1561248000

https://backpack.tf/profiles/76561198415525729#!/compare/1561161600/1561248000

Untrace

Sale 7:

https://backpack.tf/profiles/76561198415525729#!/compare/1561161600/1561248000

https://backpack.tf/profiles/76561198830630023#!/compare/1561161600/1561248000

Sold for 9 keys

sale 8:

https://backpack.tf/profiles/76561198830630023#!/compare/1561334400/1561420800

https://backpack.tf/profiles/76561198060410316#!/compare/1561075200/1561420800

Sold with 2 keys for Of Swatter + negligible sweets

use there

Sale 9:

https://backpack.tf/profiles/76561198060410316#!/compare/1561420800/1561507200

https://backpack.tf/profiles/76561198252902596#!/compare/1547164800/1561507200

Sold for Searing Airdog(14)

Sale 10:

https://backpack.tf/profiles/76561198337734785#!/compare/1566518400/1566604800

https://backpack.tf/profiles/76561198272146813#!/compare/1566518400/1566604800

Keys

sale 11:

https://marketplace.tf/items/tf2/30029;5;u29

$18.62 / $1.82 = 10.23 keys

https://backpack.tf/item/6515998787

Total sales @:

8.5, 9, 9, 10, 10.23, 14 keys

10 unsold for 2 months,

taking 8.5 - 10 keys