Sale 1:

https://backpack.tf/profiles/76561197961279983#!/compare/1566000000/1566086400

https://backpack.tf/profiles/76561198060705509#!/compare/1565913600/1566000000

Sold for 14 keys

Sale 2:

https://backpack.tf/profiles/76561198138723795#!/compare/1560988800/1561161600

https://backpack.tf/profiles/76561198335791307#!/compare/1560902400/1560988800

Bulk

sale 3:

https://backpack.tf/profiles/76561198265094154#!/compare/1564963200/1565136000

https://backpack.tf/profiles/76561198012537041#!/compare/1565049600/1565136000

Sold for Stormy Fukumigasa

Fuku Mini:

https://backpack.tf/suggestion/5d771b886780720f644ef3e9

Suggestion for 13 keys

Sale 4:

https://backpack.tf/profiles/76561198012537041#!/compare/1566259200/1566345600

https://backpack.tf/profiles/76561198134538517#!/compare/1566691200/1566777600

Untrace

Sale 5, 6:

https://marketplace.tf/items/tf2/15151;15;w1;pk85;kt-3

$24 / $1.82 = 13.19 keys

$21 / $1.84 = 11.41 keys

Sale 7, 8:

https://marketplace.tf/items/tf2/15151;15;w1;pk85;kt-2

$15.01 / $1.82 = 8.25 keys

$32.99 / $1.82 = 18.13 keys <-- https://backpack.tf/item/4779012259

Sale 9, 10:

https://marketplace.tf/items/tf2/15151;15;w1;pk85

$15 / $1.82 = 8.24 keys

$33.99 / $1.83 = 18.57 keys

Total sales @:

8.24, 8.25, 11.41, 13, 13.19, 14, 18.13, 18.57 keys

Buyers up to 10 keys,

gonna call 18 high,

8 low,

taking 11 - 14 keys.