The Sale:

Sold for 7 keys + ~0.5 keys in metal

Seller: https://backpack.tf/profiles/76561198311498888#!/compare/1550620800/1550707200

Buyer: https://backpack.tf/profiles/76561198827530902#!/compare/1550620800/1550707200

https://backpack.tf/item/7495789165

X = 7.5

Marketplace Sales:

https://marketplace.tf/items/30836;5;u7

https://manic.tf/keyprice/?at=2019-02-16 - $14.01 / $1.8 = 7.78 keys

X = 8

Other Sales:

https://backpack.tf/item/7495789165 (#1-5, gambling was involved)

https://backpack.tf/item/5373599506 - marketplace

#1

Untraceable

https://backpack.tf/profiles/76561198147578696#!/compare/1548892800/1549238400

https://backpack.tf/profiles/76561198121830870#!/compare/1548806400/1548892800

#2

Untraceable

https://backpack.tf/profiles/76561198838870134#!/compare/1550361600/1550448000

https://backpack.tf/profiles/76561198311498888#!/compare/1550361600/1550448000

#3

Untraceable

https://backpack.tf/profiles/76561198827530902#!/compare/1550707200/1550793600

https://backpack.tf/profiles/76561198805459050#!/compare/1550707200/1550880000

Keys match on the buyer’s end.

#4

Untraceable

https://backpack.tf/profiles/76561198311498888#!/compare/1551398400/1551484800

https://backpack.tf/profiles/76561198142755528#!/compare/1551398400/1551484800

Probably sold for the same amount as the traceable sale from the same seller, but can’t confirm that.

#5

Sold with a couple keys in items for Stormy Sola Topi

https://backpack.tf/profiles/76561198216172960#!/compare/1553126400/1553299200

https://backpack.tf/profiles/76561198814345631#!/compare/1553212800/1553299200

Sellers:

https://i.imgur.com/YqVvB9a.png

https://backpack.tf/item/7495789165 - 8 keys

https://backpack.tf/item/6859367990 - ~8.5 keys

https://backpack.tf/item/5358626154 - 11 keys

Sales at:

7.5

8

Going with 7.5-8.