https://backpack.tf/item/4161649742 - Contains all sales here, including unused ones.

Sale 1: - Credit to Julia

Sold for 17 keys + 20 ref

Seller: https://backpack.tf/profiles/76561198080179568#!/compare/1534636800/1534723200

Buyer: https://backpack.tf/profiles/76561198144877402#!/compare/1534636800/1534723200

https://cdn.discordapp.com/attachments/298073323219320834/490027747695919125/AB8OJFEVSYeAAAAAElFTkSuQmCC.png

X = 18

Sale 2:

Bought from scrap.tf for 16 keys + some ref

Seller: https://backpack.tf/profiles/76561198135388328#!/compare/1533600000/1533686400

Buyer: https://backpack.tf/profiles/76561198804041465#!/compare/1533600000/1533686400

https://backpack.tf/item/4161649742

X = 16

Sale 3:

Sold for 15 keys

Seller: https://backpack.tf/profiles/76561198150761253#!/compare/1532390400/1532822400

Buyer: https://backpack.tf/profiles/76561198165055074#!/compare/1532736000/1532822400

https://backpack.tf/item/4161649742

X = 15

Other Sales:

https://backpack.tf/item/4161649742 (#1

#1

Bulk for keys

https://backpack.tf/profiles/76561198165055074#!/compare/1532908800/1532995200

https://backpack.tf/profiles/76561198112336424#!/compare/1532908800/1532995200

#2

Untraceable, sold to scrap.tf

https://backpack.tf/profiles/76561198112336424#!/compare/1533513600/1533600000

https://backpack.tf/profiles/76561198135388328#!/compare/1533513600/1533600000

#3

Bulk for Beams Airdog

https://backpack.tf/profiles/76561198804041465#!/compare/1533600000/1533686400

https://backpack.tf/profiles/76561198114312016#!/compare/1533513600/1533686400

#4

Sold with 2 keys for Purple Energy Hetman’s Headpiece

No outpost

https://backpack.tf/profiles/76561198114312016#!/compare/1533513600/1533686400

https://backpack.tf/profiles/76561198286499970#!/compare/1533340800/1533686400

May be better to use on the Headpiece, if it isn’t too low there.

#5

Bulk for Terror-Watt Hat To Kill For

https://backpack.tf/profiles/76561198286499970#!/compare/1533945600/1534032000

https://backpack.tf/profiles/76561198080179568#!/compare/1533945600/1534032000

Being used on the HTKF.

No current sellers.

Sales at:

15

16

18

Might be a good idea to exclude 15, given that 16 was bought from scrap.tf.

Going with 16-18.