Sale 1:

Sold for Cloud 9 Crocleather Slouch (Suggestion at 26)

Seller: https://backpack.tf/profiles/76561198256438505#!/compare/1553212800/1553299200

Buyer: https://backpack.tf/profiles/76561198092224185#!/compare/1553299200/1553385600

https://bot.tf/stats/listings/4ZWXKE04 - B/O of 31

https://backpack.tf/item/1459720942

X = 26

Sale 2:

Sold to a quickbuyer for 19 keys + 15 ref

Seller: https://backpack.tf/profiles/76561198092224185#!/compare/1553385600/1553472000

Buyer: https://backpack.tf/profiles/76561198337734785#!/compare/1553299200/1553385600

https://backpack.tf/item/1459720942

X = 19

Marketplace Sales:

https://marketplace.tf/items/602;5;u19

https://manic.tf/keyprice/?at=2019-01-11 - $58 / $1.75 = 33.14 keys

https://backpack.tf/item/1459720942

https://i.imgur.com/h173EbA.png - B/O of 31

X = 31 (Capped by B/O)

Other Sales:

https://backpack.tf/item/7079884356 (marketplace)

https://backpack.tf/item/3532802390 (#1)

https://backpack.tf/item/1459720942 (#2)

#1

Bulk for Green Confetti Soldered Sensei

https://backpack.tf/profiles/76561198255951964#!/compare/1546387200/1546560000

https://backpack.tf/profiles/76561198119149660#!/compare/1546473600/1546560000

https://backpack.tf/item/3532802390

#2

Bulk for Beams Slo-Poke

https://backpack.tf/profiles/76561198170186586#!/compare/1546905600/1547251200

https://backpack.tf/profiles/76561198148511293#!/compare/1547164800/1547251200

#3

Sold for an unusual shotgun

https://backpack.tf/profiles/76561198148511293#!/compare/1552867200/1552953600

https://backpack.tf/profiles/76561198443546717#!/compare/1552780800/1553212800

#4

Untraceable

https://backpack.tf/profiles/76561198443546717#!/compare/1553212800/1553299200

https://backpack.tf/profiles/76561197961805093#!/compare/1553126400/1553212800

Cloud 9 Crocleather:

https://backpack.tf/suggestion/5ca60f0ed3817256e44717d8

Sellers:

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

https://backpack.tf/item/1459720942 - ~23.4 keys

https://backpack.tf/item/3532802390 - 30 keys

https://backpack.tf/item/7079884356 - 31 keys

https://backpack.tf/item/3437172118 - 32 keys

Sales at:

19

26

31

19 went to a buy order, excluding.

31 is an outlier given two sellers for cheaper, one significantly cheaper than the other. Excluding 31.

Using the seller for the low-end.

Going with 23-26.