Sale 1:

https://backpack.tf/profiles/76561198148843171#!/compare/1546732800/1546819200

https://backpack.tf/profiles/76561198252999692#!/compare/1546732800/1546819200

Sold for ~7.5 keys

Sale 2:

https://backpack.tf/profiles/76561198252999692#!/compare/1546905600/1546992000

https://backpack.tf/profiles/76561198355790690#!/compare/1546905600/1546992000

Sold for ~9 keys

Sale 3:

https://backpack.tf/profiles/76561198355790690#!/compare/1547078400/1547164800

https://backpack.tf/profiles/76561198095407289#!/compare/1545955200/1547078400

Untrace

Sale 4:

https://backpack.tf/profiles/76561198219185620#!/compare/1546992000/1550102400

https://backpack.tf/profiles/76561198173180554#!/compare/1549497600/1549584000

Sold for CTFL Mongolian

Mong Mini:

https://backpack.tf/suggestion/5c7b53e46780723dc1580e10

Suggestion for 8.5 keys

Sale 5:

https://backpack.tf/profiles/76561198173180554#!/compare/1550188800/1550880000

https://backpack.tf/profiles/76561198013377388#!/compare/1549238400/1550880000

Sold for 10 keys

Sale 6:

https://backpack.tf/profiles/76561198133868529#!/compare/1547596800/1547683200

https://backpack.tf/profiles/76561198159828753#!/compare/1547596800/1547683200

Untrace

Sale 7:

https://backpack.tf/profiles/76561198159828753#!/compare/1547596800/1547683200

https://backpack.tf/profiles/76561198200970331#!/compare/1547596800/1547769600

https://backpack.tf/profiles/76561198337734785#!/compare/1547510400/1547596800

Untrace

Sale 8:

https://marketplace.tf/items/30836;5;u60

$16.99 / $1.75 = 9.71 keys

Total sales @:

7.5, 8.5, 9, 9.71, 10 keys

Sellers down to 9 keys,

buyers up to ~7.5 keys,

gonna take 8.5 - 9, as unsold for 10 months is a big point against including.