Sales 1 and 2:

Sold for $46.99 and $44 on Marketplace.tf

https://marketplace.tf/items/518;5;u34;strange

https://marketplace.tf/items/518;5;u34

https://backpack.tf/item/4848931054

https://backpack.tf/item/4848931054 (strangifier most likely applied after purchase)

46.99/1.9 = ~24.7

44/1.9 = ~23.2

X = 23 & 25

Sale 3:

Sold for Cloud 9 Voodoo JuJu (Suggestion at 17) + ~4 keys in pure/items

http://www.tf2outpost.com/trade/29399214 - No visible B/O

Seller: https://backpack.tf/profiles/76561198269371230#!/compare/1509408000/1509753600

Buyer: https://backpack.tf/profiles/76561198168169215#!/compare/1509667200/1509753600

X = 21

Cloud 9 Voodoo:

https://backpack.tf/suggestion/5a0c439544325a73617ac84a

Sellers:

~21.7 keys:

https://i.imgur.com/kN7CZ48.png - 13 days, definitely lowered/re-listed

Sales at:

21

23

25

Going with 21-25.