https://marketplace.tf/items/tf2/31074;5;u123

$22.10 / $1.68 = 13.15 keys

$29.49 / $1.77 = 16.66 keys

$28.00 / $1.87 = 14.97 keys

$20.20 / $1.91 = 10.58 keys

$24.67 / $1.89 = 13.05 keys

https://backpack.tf/item/8297066722

//

https://backpack.tf/profiles/76561198341171690#!/compare/1585094400/1585180800

https://backpack.tf/profiles/76561197994783413#!/compare/1585094400/1585180800

10 keys

//

https://backpack.tf/profiles/76561197994783413#!/compare/1588464000/1588550400

https://backpack.tf/profiles/76561198158206236#!/compare/1588377600/1588464000

Bulk

//

https://backpack.tf/profiles/76561198158206236#!/compare/1588464000/1588550400

https://backpack.tf/profiles/76561198363395191#!/compare/1588464000/1588636800

Untraceable

//

https://backpack.tf/profiles/76561198135665117#!/compare/1586995200/1587081600

https://backpack.tf/profiles/76561198330231701#!/compare/1586995200/1587081600

Strange Specialized Killstreak Australium Frontier Justice (10 keys) https://gyazo.com/b8eb6f28dfbf7c5ef5cc787f5dc5bacf

//

https://backpack.tf/profiles/76561198047941585#!/compare/1587081600/1587168000

https://backpack.tf/profiles/76561198330231701#!/compare/1587081600/1587168000

Bulk

//

https://backpack.tf/profiles/76561198039834209#!/compare/1589068800/1589155200

https://backpack.tf/profiles/76561198187599807#!/compare/1588982400/1589414400

Bulk for keys

//

https://backpack.tf/profiles/76561198028927375#!/compare/1585440000/1586649600

https://backpack.tf/profiles/76561198391742214#!/compare/1587254400/1587254400

Untraceable

//

Sales:

10

10

11

13

13

15

17

Buyers at 9.5

https://gyazo.com/eda090882bfca18e68d7317743af920e

Sellers at 12.5, one of them has had for a while

https://backpack.tf/item/8311332137

https://backpack.tf/item/8166988955

Going with 11-13