Hernan Cortez

https://backpack.tf/item/1790221996

Sale 1) Sold for 13 Keys + 1 Refined

https://backpack.tf/profiles/76561198025289674#!/compare/1520121600/1520985600

https://gyazo.com/9676b270040989e3f98f0818d9f4ea22

Rounds to 13 Keys

Sale 2) Sold for 13 Keys + 10 Refined

https://backpack.tf/profiles/76561198304138933#!/compare/1523232000/1523318400

https://gyazo.com/9676b270040989e3f98f0818d9f4ea22

Rounds to 13 Keys

https://backpack.tf/item/2175945779

Sale 3) Sold for 13 Keys + 14 Refined

https://backpack.tf/profiles/76561198304138933#!/compare/1520899200/1520985600

https://gyazo.com/9676b270040989e3f98f0818d9f4ea22

Rounds to 13 Keys

Sale 4) ?

https://backpack.tf/profiles/76561198071518291#!/compare/1524960000/1527120000

https://backpack.tf/profiles/76561198360479576#!/compare/1523491200/1526947200

Sale 5) Sold for a Strange Searing Plasma Archer's Sterling

https://backpack.tf/profiles/76561198360479576#!/compare/1527120000/1527206400

https://backpack.tf/profiles/76561198289341641#!/compare/1527206400/1527292800

https://backpack.tf/item/4237246107

Sale 6) Sold for 13 Keys + 16 Refined

https://backpack.tf/profiles/76561198304138933#!/compare/1520208000/1520294400

https://gyazo.com/9676b270040989e3f98f0818d9f4ea22

Rounds to 13 Keys (Keys were >32 Refined at the time)

Sale 7) Sold for a Midnight Whirlwind Luxury Lounge (10.5 Keys)

https://backpack.tf/profiles/76561198126703469#!/compare/1521072000/1521331200

https://backpack.tf/profiles/76561198180728714#!/compare/1521331200/1521417600

Low outlier.

Sale 8) Bulk sale for a Cloud 9 Executioner

https://backpack.tf/profiles/76561198180728714#!/compare/1521417600/1521676800

Sale 9) Sold for 13 Keys

https://backpack.tf/profiles/76561198004517334#!/compare/1525564800/1525651200

Sale 10) Sold for 13 Keys + ~0.6 Keys of Items

https://backpack.tf/profiles/76561198358827815#!/compare/1526083200/1526169600

https://backpack.tf/profiles/76561198103079986#!/compare/1526169600/1526688000

13 + 0.6 = 13.6, which rounds to 14 Keys

https://backpack.tf/item/2224761005

Sale 11) Sold for an Aces High Chieftain's Challenge + 1 Key

https://backpack.tf/profiles/76561198125791160#!/compare/1522454400/1522540800

Since the Chieftain is somewhere between 11 to 14 Keys, roughly, this sale fits in the range.

Chieftain's Mini

https://backpack.tf/profiles/76561198021055079#!/compare/1520726400/1520812800 - Sold for a Nuts Nickel + 20 Keys

http://www.tf2outpost.com/trade/29602421 - Had a Buyout of 14 Keys

https://imgur.com/a/lGgSImq - Sellers at 13 Keys (9 Days) and 14 Keys (10 Days, 3 Months). Buyers at 12 Keys.

https://backpack.tf/profiles/76561198253485116#!/compare/1521158400/1521331200 - Sold for a Steaming Airdog

https://imgur.com/a/lOJvI0w - Sellers at 11 (14 Days) and 12 Keys (10 Days)

Sale 12) Sold for a Professional Killstreak Batsaber (11.5 Keys) + ~2.5 Keys of Items

https://backpack.tf/profiles/76561198191544534#!/compare/1522540800/1523232000

11.5 + 2.5 = 14 Keys

Sale 13) Sold for a Kill-a-Watt Ol' Guadalajara (~16 Keys)

https://backpack.tf/profiles/76561198099132915#!/compare/1523750400/1523836800

High Outlier.

Guadalajara Mini

https://backpack.tf/profiles/76561198207020461#!/compare/1524355200/1524441600 - Sold for 15 Keys

https://backpack.tf/profiles/76561198182213262#!/compare/1524873600/1524960000 - Sold for a SI Bandito + ~4 Keys of Items or Mixed (idk which)

https://backpack.tf/profiles/76561198203118623#!/compare/1524787200/1524960000 - Buyer's side for the above sale

Since the Bandito is ~12 - 13 Keys, the Guadalajara is ~15 - 17 Keys.

Bandito Macro

https://imgur.com/a/7S7xsZg - Sellers at 13 Keys (Young) and 14 Keys (2 Months x2). Buyers at 11.3 Keys and 11.2 Keys.

Sale 14) Sold for a Factory New Hot Polar Surprise Scattergun

https://backpack.tf/profiles/76561198162286080#!/compare/1524182400/1524268800

Sale 15) Sold for a '72 Box Trot

https://backpack.tf/profiles/76561198181811458#!/compare/1525824000/1525996800

This would be better used to update the Box Trot.

Sale 16) ?

https://backpack.tf/profiles/76561198168169215#!/compare/1525996800/1526083200

Sale 17) ?

https://backpack.tf/profiles/76561198087042029#!/compare/1525996800/1526083200

Sale 18) Sold for a Blizzardy Storm Polar Puffy Cap

https://backpack.tf/profiles/76561198136240234#!/compare/1525824000/1526083200

This would be better used to price the Puffy Cap.

Sale 19) ?

https://backpack.tf/profiles/76561198332925604#!/compare/1526428800/1526688000

Sale 20) ?

https://backpack.tf/profiles/76561198057924587#!/compare/1526601600/1526688000

Sale 21) Sold for either 12 Keys or a Green Confetti Archer's Sterling (11.5 Keys)

https://backpack.tf/profiles/76561198271428863#!/compare/1526688000/1526774400

https://backpack.tf/profiles/76561198261338575#!/compare/1526688000/1526774400

The Archer's would round to 12 Keys anyways.