Sale 1:

https://backpack.tf/profiles/76561198337734785#!/compare/1589328000/1589414400

https://backpack.tf/profiles/76561198335431391#!/compare/1589241600/1589414400

sold for ~15 keys

sale 2:

https://backpack.tf/profiles/76561198335431391#!/compare/1589414400/1589673600

https://backpack.tf/profiles/76561198850274253#!/compare/1589328000/1589414400

Sold for ~12 keys

sale 3:

https://backpack.tf/profiles/76561198850274253#!/compare/1590019200/1589932800

https://backpack.tf/profiles/76561198850178158#!/compare/1589932800/1590019200

Transfer

sale 4:

https://backpack.tf/profiles/76561198850178158#!/compare/1592092800/1592179200

https://backpack.tf/profiles/76561198345231611#!/compare/1592092800/1592179200

Untrace

sale 5:

https://backpack.tf/profiles/76561198157279796#!/compare/1585526400/1585612800

https://backpack.tf/profiles/76561198119556478#!/compare/1585440000/1585526400

Untrace

Sale 6:

https://backpack.tf/profiles/76561198119556478#!/compare/1585440000/1585526400

https://backpack.tf/profiles/76561198203657571#!/compare/1585440000/1585526400

Sold with 1 key for PE Pure tin + ~1 key in sweets

Pure Mini:

https://backpack.tf/suggestion/5ef9900939d85e19eb348236

Suggestion for 17.5 keys

Total is 17.5 keys

sale 7:

https://backpack.tf/profiles/76561198203657571#!/compare/1586563200/1586908800

https://backpack.tf/profiles/76561198175114914#!/compare/1586390400/1586908800

Sold with ~10 keys in sweets for CH Scrap + 5 keys

better there

sale 8:

https://backpack.tf/profiles/76561198305494036#!/compare/1591401600/1591488000

https://backpack.tf/profiles/76561198141187659#!/compare/1591401600/1591488000

https://backpack.tf/profiles/76561198305494036#!/compare/1591826400/1591912800

sold then QS back

sale 9:

https://backpack.tf/profiles/76561198305494036#!/compare/1592006400/1592092800

https://backpack.tf/profiles/76561198202672367#!/compare/1592006400/1592092800

Sold for ~10 keys

Total sales @:

10, 12, 15, 18 keys

given that 15 resold for lower...

taking 10 - 15 keys.