MINI for Steaming Tartan Spartan - https://backpack.tf/suggestion/5e07fe1ebb5dc4085477aad2

Sale 1:

https://backpack.tf/item/7453590514

https://backpack.tf/profiles/76561198031524068#!/compare/1572480000/1572652800

https://backpack.tf/profiles/76561198050617344#!/compare/1564444800/1573171200

Untraceable

Sale 2:

https://backpack.tf/item/7246914359

https://backpack.tf/profiles/76561198240841312#!/compare/1570320000/1572134400

https://backpack.tf/profiles/76561198084089059#!/compare/1568160000/1573776000

Untraceable

Sale 3:

https://backpack.tf/item/7463333729

https://backpack.tf/profiles/76561198080394134#!/compare/1572393600/1572480000

https://backpack.tf/profiles/76561198064873366#!/compare/1572134400/1572652800

Untraceable

Sale 4:

https://backpack.tf/item/5558641246

https://backpack.tf/profiles/76561198868286835#!/compare/1571702400/1571875200

https://backpack.tf/profiles/76561198197215790#!/compare/1571702400/1571961600

Sale 5:

https://backpack.tf/item/6449103907

Sold for 10 Keys Pure

https://backpack.tf/profiles/76561198278481498#!/compare/1571011200/1571184000

https://backpack.tf/profiles/76561198260201158#!/compare/1571011200/1571097600

Sale 6:

https://backpack.tf/item/6449103907

https://backpack.tf/profiles/76561198328984748#!/compare/1570752000/1570924800

https://backpack.tf/profiles/76561198278481498#!/compare/1570752000/1571011200

Untraceable

Sale 7:

https://backpack.tf/item/6803308422

Sold for 14 Keys Pure

https://backpack.tf/profiles/76561198093788180#!/compare/1571443200/1571616000

https://backpack.tf/profiles/76561198119198857#!/compare/1571443200/1571616000

Sale 8:

https://backpack.tf/item/6396436557

https://backpack.tf/profiles/76561198424722948#!/compare/1576108800/1576368000

https://backpack.tf/profiles/76561198072073083#!/compare/1574812800/1576281600

Untraceable

Sale 9:

https://backpack.tf/item/6396436557

https://backpack.tf/profiles/76561198101092551#!/compare/1575849600/1575936000

https://backpack.tf/profiles/76561198424722948#!/compare/1575849600/1575936000

Untraceable

Sale 10:

https://backpack.tf/item/6122004665

Sold for a Steaming Tartan Spartan (8.5 Keys) and 2 Keys Pure

Going with 6.5 Keys

https://backpack.tf/profiles/76561198431364010#!/compare/1575676800/1575763200

https://backpack.tf/profiles/76561198118518523#!/compare/1575676800/1575763200

Marketplace Sales

https://marketplace.tf/items/tf2/30816;5;u3030

Sale 11:

https://backpack.tf/item/7931452281

Sold on Oct 14th for $30, Keys were $1.82

Rounding 16.48~ Keys down to 16 Keys

Sale 12:

https://backpack.tf/item/5837960826

Sold on Nov 28th for $17.79, Keys were $1.73

Rounding 10.28~ keys down to 10 Keys

Excluding 14 & 16 as outliers, going with 6.5-10 Keys