Credits to scourge

Sale 1:

https://backpack.tf/profiles/76561198079296534#!/compare/1583452800/1585526400

https://backpack.tf/profiles/76561198203811797#!/compare/1592438400/1592524800

Untrace

sale 2:

https://backpack.tf/profiles/76561198203811797#!/compare/1592438400/1592524800

https://backpack.tf/profiles/76561199052009004#!/compare/1590624000/1592524800

Sold for Searing Tavish

use there, few sales

sale 3:

https://backpack.tf/profiles/76561199052009004#!/compare/1592524800/1592870400

https://backpack.tf/profiles/76561198096621282#!/compare/1592438400/1592611200

Untrace

Sale 4:

https://backpack.tf/profiles/76561198096621282#!/compare/1592611200/1593129600

https://backpack.tf/profiles/76561198267189538#!/compare/1592697600/1592784000

Untrace

sale 5:

https://backpack.tf/profiles/76561198325595749#!/compare/1586131200/1586217600

https://backpack.tf/profiles/76561198314776045#!/compare/1586131200/1586217600

Untrace

sale 6:

https://backpack.tf/profiles/76561198314776045#!/compare/1586304000/1586476800

https://backpack.tf/profiles/76561198211890761#!/compare/1586131200/1586476800

Sold for ~16 keys

sale 7:

https://backpack.tf/profiles/76561198211890761#!/compare/1586563200/1586649600

https://backpack.tf/profiles/76561198142251077#!/compare/1586476800/1586563200

Sold with ~2 keys in sweets for KaW France (21.5 keys) = 19.5 keys.

~20 keys.

France Mini:

https://backpack.tf/suggestion/5ef7b6acc7df86236a5159a6

sale 8:

https://backpack.tf/profiles/76561198142251077#!/compare/1586563200/1586649600

https://backpack.tf/profiles/76561198026066876#!/compare/1586476800/1586563200

sold for 17 keys

sale 9:

https://backpack.tf/profiles/76561198026066876#!/compare/1586476800/1586563200

https://backpack.tf/profiles/76561198985910282#!/compare/1586563200/1586649600

Sold with 3 keys for Miami Chieftain

use there, needed to set range.

sale 10:

https://backpack.tf/profiles/76561198985910282#!/compare/1587340800/1587427200

https://backpack.tf/profiles/76561198132155559#!/compare/1587081600/1587427200

Sold for 15 keys

sale 11:

https://backpack.tf/profiles/76561198132155559#!/compare/1587686400/1588118400

https://backpack.tf/profiles/76561198076675313#!/compare/1588032000/1588118400

Untrace

sale 12:

https://marketplace.tf/items/tf2/51;5;u8

$34.95 / $1.75 = 19.97 keys

$39.99 / $1.87 = 21.39 keys

Total sales @:

15, 16, 17, 20, 21 keys

Going with 15-21 keys..