Sale 1:

https://backpack.tf/profiles/76561198254653628#!/compare/1566777600/1566950400

https://backpack.tf/profiles/76561198983438713#!/compare/1566864000/1566950400

Sold with a key for C9 Armored

use there, sales are all over the place.

Sale 2:

https://backpack.tf/profiles/76561198983438713#!/compare/1566864000/1566950400

https://backpack.tf/profiles/76561198266985238#!/compare/1566864000/1566950400

Sold for CTFL Toy Soldier(16.5)

Sale 3:

https://backpack.tf/profiles/76561198266985238#!/compare/1567123200/1567209600

https://backpack.tf/profiles/76561198204215081#!/compare/1567123200/1567209600

Sold for Maimi Backbiter(16)

Sale 4:

https://backpack.tf/profiles/76561198204215081#!/compare/1567209600/1567296000

https://backpack.tf/profiles/76561198117834823#!/compare/1567209600/1567296000

Sold for Aces Crasher + 2 keys

Crasher Mini:

https://backpack.tf/suggestion/5d8e68dcd38172551251b3a1

Suggestion for 13 keys

Total is 15 keys

Sale 5:

https://backpack.tf/profiles/76561198117834823#!/compare/1567209600/1567296000

https://backpack.tf/profiles/76561198002757046#!/compare/1567209600/1567296000

QS

Sale 6:

https://backpack.tf/profiles/76561198002757046#!/compare/1567382400/1567468800

https://backpack.tf/profiles/76561198070705963#!/compare/1567382400/1567468800

Sold for Vivid Noble + 3 keys(?)

noble doesn't match....

Sale 7:

https://marketplace.tf/items/tf2/381;5;u56

$36.18 / $1.84 = 19.66 keys

https://backpack.tf/item/7956225188

No B/O

Total sales @:

15, 16, 16.5, 19.66 keys

Taking 15 - 20 keys