Sale 1:

Sold for 12 keys

Seller: https://backpack.tf/profiles/76561198334598690#!/compare/1548460800/1548547200

Buyer: https://backpack.tf/profiles/76561198304600619#!/compare/1548460800/1548547200

https://backpack.tf/item/4983258876

X = 12

The keys:

https://backpack.tf/item/7513972481

https://backpack.tf/item/7513972487

https://backpack.tf/item/7513972498

https://backpack.tf/item/7513972513

https://backpack.tf/item/7513972524

https://backpack.tf/item/7513972544

https://backpack.tf/item/7513972551

https://backpack.tf/item/7513972561

https://backpack.tf/item/7513972574

https://backpack.tf/item/7513972585

https://backpack.tf/item/7513972590

https://backpack.tf/item/7513972604

X = 12

Sale 2:

Sold for 12 keys

Seller: https://backpack.tf/profiles/76561198236814044#!/compare/1548720000/1548892800

Buyer: https://backpack.tf/profiles/76561198012537041#!/compare/1548806400/1548892800

https://backpack.tf/item/2784858132 (the rest in this history is gambled/scrap)

X = 12

Sale 3:

Sold for 10 keys

Seller: https://backpack.tf/profiles/76561198125612269#!/compare/1553126400/1553212800

Buyer: https://backpack.tf/profiles/76561198062197943#!/compare/1553126400/1553212800

https://backpack.tf/item/5232744752

X = 10

Marketplace Sales:

https://marketplace.tf/items/1113;5;u3014

https://manic.tf/keyprice/?at=2019-03-01 - $16.34 / $1.78 = 9.18 keys

X = 9

Other Sales:

https://backpack.tf/item/5087912263 (#1)

https://backpack.tf/item/4983258876 (#2 & #3)

https://backpack.tf/item/2721605560 - tradebacks

#1

Bulk for pure

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

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

#2

Untraceable

https://backpack.tf/profiles/76561198084386250#!/compare/1548374400/1548460800

https://backpack.tf/profiles/76561198334598690#!/compare/1548288000/1548374400

https://i.imgur.com/zS63jlH.png - labelled as 6 keys + 4 ref

#3

Bulk for pure

https://backpack.tf/profiles/76561198124728984#!/compare/1554508800/1554595200

https://backpack.tf/profiles/76561197994697258#!/compare/1554508800/1554595200

Sellers:

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

https://backpack.tf/item/4983258876 - 20 keys

https://backpack.tf/item/5238054620 - ~34.5 keys

https://backpack.tf/item/2746026689 - 35 keys

Sales at:

9

10

12 (2x)

The 9 key sale on marketplace would’ve gone to a marketplace buy order. Excluding 9.

Going with 10-12.