Sterling Sliver of Health

https://backpack.tf/item/7087823078

Sale 1) Sold for 16 Keys

https://backpack.tf/profiles/76561198095236132#!/compare/1544918400/1545004800

Low outlier.

https://backpack.tf/item/6966359020

Sale 2) ?

https://backpack.tf/profiles/76561198049888405#!/compare/1540512000/1540771200

https://backpack.tf/item/6853576234

Sale 3) Sold for a Terror-Watt Tin Capotain (9 Keys) + Smoking Head Full of Hot Air (8.75 Keys)

https://backpack.tf/profiles/76561198066195760#!/compare/1541808000/1541894400

9 + 8.75 = 17.75, which rounds to 18 Keys

Capotain Mini

https://backpack.tf/suggestion/5c1ace3044325a3a5c50bd7d - 9 Keys

Hot Air Mini

https://backpack.tf/suggestion/5c1b19d644325a73ba2c1b05 - 8.75 Keys

Sale 4) Sold for a Kill-a-Watt Private Eye + 3 Keys

https://backpack.tf/profiles/76561198215130228#!/compare/1542067200/1542326400 - Buyer's Backpack

Sale 5) Sold + 4 Keys for a Cloud 9 Modest Metal Pile of Scrap

https://backpack.tf/profiles/76561198012472736#!/compare/1542412800/1542499200 - Seller's Backpack

https://backpack.tf/profiles/76561198074178367#!/compare/1542412800/1542499200 - Buyer's Backpack

Low outlier because of these Modest Sellers at 20 and 22 Keys: https://imgur.com/a/qv7aRY1

https://backpack.tf/item/2607867012

https://backpack.tf/item/1949633263

https://backpack.tf/item/6629719817

Sale 6) Quicksold for 16 Keys + Treasure Hat

https://backpack.tf/profiles/76561198074178367#!/compare/1542412800/1542499200

Sale 7) ?

https://backpack.tf/profiles/76561198401509004#!/compare/1543017600/1543104000

Sale 8) Quicksold for 18 Keys

https://backpack.tf/profiles/76561198002757046#!/compare/1543104000/1543190400

Sale 9) Sold for a Black Max's Severed Head (~19 Keys)

https://backpack.tf/profiles/76561198339329967#!/compare/1543708800/1543881600

Sale 10) Sold + 2 Keys for a Team Spirit Max's Severed Head (~19 Keys)

https://backpack.tf/profiles/76561198118199330#!/compare/1543881600/1544054400

Low outlier.

Taking 18 Keys because there's 2 sales at it, but using the fact that the Pure sale at 18 quicksold to say that 16 and 17 are low.