Cold Darkness

https://backpack.tf/item/5078849344

Sale 1) Sold for a Molten Mallard Runner's Warm-Up + ~3 Keys of Items

https://backpack.tf/profiles/76561198057541872#!/compare/1544313600/1544486400

This sale is being used to price the Runner's.

https://backpack.tf/item/5703409451

Sale 2) ?

https://backpack.tf/profiles/76561198316071886#!/compare/1541030400/1541116800

https://backpack.tf/profiles/76561198038531992#!/compare/1541289600/1544832000

https://backpack.tf/item/7289349327

Sale 3) Bulk sale

https://backpack.tf/profiles/76561198248296912#!/compare/1542672000/1542758400

Sale 4) Sold for 33 Keys

https://backpack.tf/profiles/76561198054198170#!/compare/1544400000/1544659200

https://backpack.tf/item/5986378783

Sale 5) Sold for a Cloud 9 Antarctic Eyewear (33.5 Keys)

https://backpack.tf/profiles/76561198041056539#!/compare/1540166400/1540252800

This was used to price the Eyewear.

Sale 6) Sold + 6 Keys + ~2 Keys of Items for a Disco Beat Down Tundra Top (43.5 Keys)

https://backpack.tf/profiles/76561198158554103#!/compare/1540252800/1540339200

43.5 - 6 - 2 = 35.5, which rounds to 36 Keys

Sale 7) Sold for a Green Confetti Commando Elite (11 Keys) + Circling TF Logo Coupe D'isaster + 9 Keys

https://backpack.tf/profiles/76561198326246857#!/compare/1540252800/1540339200 - Buyer's Backpack

Fits in the range.

Elite Mini

https://marketplace.tf/items/30912;5;u6 - Sold for $22.50 when Keys were ~$1.72 each

https://marketplace.tf/items/5021;6/Mann%20Co.%20Supply%20Crate%20Key

22.50 / 1.72 = 13 Keys

https://imgur.com/a/KDDJSVK - 4 Month Unsold at 11 Keys, so I'll call 13 Keys high.

https://backpack.tf/item/6425921101

Coupe Mini

https://imgur.com/a/K0Ve6MD - Seller at 9 Keys, Buyers at 8.25 Keys

https://backpack.tf/item/233029881

https://backpack.tf/u/76561198021055079

https://backpack.tf/u/76561198315588518

Sale 8) Sold for a Green Energy Airdog (27.5 Keys)

https://backpack.tf/profiles/76561198156375472#!/compare/1511654400/1541548800

Rounds to 28 Keys

Sale 9) Sold for a Bubbling Salty Dog (32.5 Keys)

https://backpack.tf/profiles/76561198066195760#!/compare/1541635200/1541721600

https://backpack.tf/profiles/76561198302759439#!/compare/1541635200/1541721600

This was used to price the Salty Dog.

Sale 10) Sold for 24 Keys

https://backpack.tf/profiles/76561198302759439#!/compare/1541894400/1541980800

https://backpack.tf/profiles/76561198160120451#!/compare/1541894400/1541980800

Sale 11) Sold for 24 Keys

https://backpack.tf/profiles/76561198160120451#!/compare/1542240000/1542326400

Sale 12) Quicksold for 25 Keys

https://backpack.tf/profiles/76561198344313987#!/compare/1542240000/1542326400

Sale 13) Sold for a Haunted Ghosts Archer's Sterling (18.5 Keys) + 5 Keys

https://backpack.tf/profiles/76561198012472736#!/compare/1542326400/1542412800

18.5 + 5 = 23.5, which rounds to 24 Keys

Sterling Mini

https://backpack.tf/suggestion/5c1b1d8ccf6c75730677c8da - 18.5 Keys

Sale 14) Sold for a Green Energy Puffy Polar Cap (29 Keys) + 5 Keys + ~1 Keys of Items

https://backpack.tf/profiles/76561198215130228#!/compare/1542412800/1542585600

https://backpack.tf/profiles/76561198437988107#!/compare/1542499200/1542585600

29 + 5 + 1 = 35 Keys

https://marketplace.tf/items/30357;5;u30 - Sold for $49 when Keys were ~$1.77 each and $50 when Keys were ~$1.74 each

https://marketplace.tf/items/5021;6/Mann%20Co.%20Supply%20Crate%20Key

49 / 1.77 = 27.68, which rounds to 28 Keys

50 / 1.74 = 28.73, which rounds to 29 Keys