Marketplace Sales:

Sold for $100 & $72 on marketplace

https://marketplace.tf/items/tf2/30413;5;u34

https://manic.tf/keyprice/?at=2019-05-05 - $72 / $1.8 = 40.00 keys

https://manic.tf/keyprice/?at=2019-06-27 - $100 / $1.84 = 54.35 keys

X = 54

X = 40

Other Sales:

https://backpack.tf/item/5666281895 (#1 & #2)

https://backpack.tf/item/5277026276 - gambled

https://backpack.tf/item/7853189260 - gambled/scrap

https://backpack.tf/item/7695550614 - marketplace

#1

Bulk for Unusual Red Rosco Pistol

https://backpack.tf/profiles/76561198871959036#!/compare/1558051200/1558224000

https://backpack.tf/profiles/76561197994697258#!/compare/1558137600/1558224000

#2

Sold for Unusual Sniper Rifle + Aussie Blutsauger?

https://backpack.tf/profiles/76561197994697258#!/compare/1558828800/1558915200

https://backpack.tf/profiles/76561198042951716#!/compare/1558828800/1558915200

I’m convinced more was involved, but isn’t traceable. Excluding.

Sellers:

https://i.imgur.com/liXA7ov.png

https://backpack.tf/item/7853189260 - 60 keys

https://backpack.tf/item/7853189260 - 60 keys

Sales at:

40

54

Going with 40-54.