Sale 1:

https://backpack.tf/profiles/76561198055109826#!/compare/1552348800/1572825600

https://backpack.tf/profiles/76561198129819677#!/compare/1572739200/1572825600

Bulk

sale 2:

https://backpack.tf/profiles/76561198125985288#!/compare/1567728000/1567814400

https://backpack.tf/profiles/76561198363395191#!/compare/1567728000/1567814400

QS for 7 keys

Sale 3:

https://backpack.tf/profiles/76561198363395191#!/compare/1568246400/1568332800

https://backpack.tf/profiles/76561198246543840#!/compare/1568246400/1568505600

Sold for 10 keys

sale 4:

https://backpack.tf/profiles/76561198377852582#!/compare/1568073600/1568246400

https://backpack.tf/profiles/76561198326756661#!/compare/1568073600/1568160000

Sold for TW Boron

use there, few sales

Sale 5:

https://backpack.tf/profiles/76561198326756661#!/compare/1568419200/1568505600

https://backpack.tf/profiles/76561198149175706#!/compare/1568332800/1568419200

Either DP Brigade or 9 keys, cant tell.

Sale 6:

https://backpack.tf/profiles/76561198149175706#!/compare/1568851200/1568937600

https://backpack.tf/profiles/76561198335791307#!/compare/1568851200/1568937600

Bulk

sale 7:

https://backpack.tf/profiles/76561198335791307#!/compare/1571616000/1571702400

https://backpack.tf/profiles/76561198188454079#!/compare/1571702400/1571788800

Keys

sale 8:

https://backpack.tf/profiles/76561198025795458#!/compare/1567036800/1567123200

https://backpack.tf/profiles/76561198204552535#!/compare/1567123200/1572566400

Sold for 16 keys

Sale 9:

https://backpack.tf/profiles/76561198204552535#!/compare/1567123200/1572566400

https://backpack.tf/profiles/76561198059976536#!/compare/1570060800/1570233600

SCM

Sale 9:

https://backpack.tf/profiles/76561198115691546#!/compare/1567728000/1567814400

https://backpack.tf/profiles/76561198055867856#!/compare/1566000000/1567814400

Sold for TW Chief

Chief Mini:

https://backpack.tf/suggestion/5dca6ff4678072313408fd6a

Suggestion for 12.5 keys

Sale 10:

https://marketplace.tf/items/tf2/459;5;u59

$21.99 / $1.81 = 12.15 keys

https://backpack.tf/item/7956910477

total sales @:

10, 12, 12.5, 16 keys

buyers up to 8 keys,

poorly bumped seller for 12 keys,

newish seller for 15 keys,

calling 16 the outlier,

taking 10 - 13 keys.