Re-suggestion,thank to Torb for pointing out my mistake!

Sale 1:

https://backpack.tf/profiles/76561198127938353#!/compare/1546992000/1547164800

https://backpack.tf/profiles/76561198122047881#!/compare/1547164800/1547251200

Sold for HG Practice + 3 keys

Practice Mini:

https://backpack.tf/suggestion/5c45523044325a5f842a9c3a

Suggestion for 26 keys

Total is 29 keys

Sale 2:

https://backpack.tf/profiles/76561198060967458#!/compare/1540944000/1541030400

https://backpack.tf/profiles/76561198073896407#!/compare/1540425600/1541030400

Sold for HG Sky High(15) + Steaming Samur-Eye(9)

Total is 24 keys

Sale 3:

https://backpack.tf/profiles/76561198073896407#!/compare/1541548800/1541635200

https://backpack.tf/profiles/76561198125791160#!/compare/1541548800/1541635200

Used on Bombing Run

Sale 4:

https://backpack.tf/profiles/76561198337734785#!/compare/1540080000/1540166400

https://backpack.tf/profiles/76561198185279689#!/compare/1539907200/1540080000

Untrace

Sale 5:

https://backpack.tf/profiles/76561198185279689#!/compare/1540512000/1540684800

https://backpack.tf/profiles/76561198337734785#!/compare/1540512000/1540771200

QS

Sale 6:

https://backpack.tf/profiles/76561198337734785#!/compare/1540771200/1540857600

https://backpack.tf/profiles/76561198340736289#!/compare/1540857600/1540944000

Sold for 18 keys

Sale 7:

https://backpack.tf/profiles/76561198061489334#!/compare/1541548800/1541635200

https://backpack.tf/profiles/76561198321456383#!/compare/1541116800/1541635200

Bulk

Sale 8:

https://backpack.tf/profiles/76561198061489334#!/compare/1545955200/1546041600

https://backpack.tf/profiles/76561198211858204#!/compare/1545955200/1546041600

Sold for 22 keys

Sale 9:

https://backpack.tf/profiles/76561198211858204#!/compare/1546905600/1547424000

https://backpack.tf/profiles/76561198359977378#!/compare/1546214400/1547683200

Untrace

Sale 10-12:

https://marketplace.tf/items/30682;5;u101

Sold for 30, 37.99, 40 USD,

Keys at 1.77, 1.80, 1.77 USD

Totals are 16.95, 21.11, 22.60 keys

Total sales @:

16.95, 18, 21.11, 22, 22.60, 24, 29 keys

Seller at 25 keys,

Buyers up to 16 keys,

Taking a tight range of 21 - 24 keys.