Sale 1:

https://backpack.tf/profiles/76561198066294505#!/compare/1531958400/1532044800

https://backpack.tf/profiles/76561198262354524#!/compare/1531958400/1532044800

Bulk.

Sale 2:

https://backpack.tf/profiles/76561198262354524#!/compare/1531958400/1532044800

https://backpack.tf/profiles/76561198839802490#!/compare/1531958400/1532044800

Bulk.

Sale 3:

https://backpack.tf/profiles/76561198839802490#!/compare/1531958400/1532044800

https://backpack.tf/profiles/76561198050062763#!/compare/1531958400/1532044800

Bulk.

Sale 4:

https://backpack.tf/profiles/76561198050062763#!/compare/1532304000/1532476800

https://backpack.tf/profiles/76561198312583107#!/compare/1532390400/1532476800

Keys, QS.

Sale 5:

https://backpack.tf/profiles/76561198151696423#!/compare/1530921600/1531267200

Untrace.

Sale 6:

https://backpack.tf/profiles/76561198824281033#!/compare/1531180800/1531267200

Sold for OF Scopers + ~1 key in sweets

Scopers Mini:

https://backpack.tf/profiles/76561198096723368#!/compare/1531699200/1532476800

Sold for 16 keys.

Sale 7:

https://backpack.tf/profiles/76561198824281033#!/compare/1531353600/1531440000

Untrace.

Sale 8:

https://marketplace.tf/items/247;5;u15

Using this sale, as few usable sales exist.

Sold for 44.9 USD

Keys at 1.97

Total is 22.79 keys

Unsold at 23 for 5 months, Buyers up to 14 keys

https://i.imgur.com/x9aTTWE.png

LEts round 22.79 down, and take 16-22 keys.