Sale 1:

https://backpack.tf/item/7060574153

QS to bot

Sale 2:

https://backpack.tf/profiles/76561198159317851#!/compare/1532390400/1532563200

https://backpack.tf/profiles/76561198268140274#!/compare/1532476800/1532563200

Sold for Mallard Sack

Use there

Sale 3:

https://backpack.tf/profiles/76561198159317851#!/compare/1532649600/1532736000

https://backpack.tf/profiles/76561198008113369#!/compare/1532476800/1532736000

Sold for Strange OF Nuke

Use there.

Sale 4:

https://backpack.tf/profiles/76561198008113369#!/compare/1533340800/1533427200

https://backpack.tf/profiles/76561198437172792#!/compare/1533340800/1533427200

Bulk.

Sale 5:

https://backpack.tf/profiles/76561198437172792#!/compare/1533600000/1533686400

https://backpack.tf/profiles/76561198090183297#!/compare/1533513600/1533686400

Sold for ~21 keys in items

Sale 6:

https://backpack.tf/profiles/76561198090183297#!/compare/1533772800/1533859200

https://backpack.tf/profiles/76561198061990233#!/compare/1533686400/1533772800

Sold for 17 keys

Sale 7:

https://backpack.tf/profiles/76561198061990233#!/compare/1533772800/1533859200

https://backpack.tf/profiles/76561197993931314#!/compare/1533859200/1533945600

Sold for 19 keys

Sale 8:

https://backpack.tf/profiles/76561198156472407#!/compare/1534032000/1534118400

Sold with ~5 keys in sweets For Steaming Caribou(24)

Total is 19 keys

Total sales @:

17, 19, 19, 21

Buyers up to 16 keys,

New sellers at 19, 22 keys.

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

https://backpack.tf/item/2226330878

https://backpack.tf/item/7060574153

Play it safe and go with 19 flat.