https://backpack.tf/item/6829322609 - covers all sales here.

Sale 1:

Sold for Green Energy Sola Topi (Suggestion at 21) + 1 key

Seller: https://backpack.tf/profiles/76561198292156436#!/compare/1532131200/1532217600

Buyer: https://backpack.tf/profiles/76561198804953242#!/compare/1532044800/1532217600

https://backpack.tf/item/6829322609

Sale 2:

Sold for 22 keys

Seller: https://backpack.tf/profiles/76561198089253101#!/compare/1534636800/1534809600

Buyer: https://backpack.tf/profiles/76561198135821092#!/compare/1534723200/1534809600

https://backpack.tf/item/6829322609

X = 22

Other Sales:

#1

Untraceable

https://backpack.tf/profiles/76561198804953242#!/compare/1532217600/1533340800

https://backpack.tf/profiles/76561198167768556#!/compare/1530316800/1533686400

#2

Untraceable

https://backpack.tf/profiles/76561198167768556#!/compare/1534636800/1536710400

https://backpack.tf/profiles/76561198089253101#!/compare/1534550400/1534636800

#3

Bulk for Burning Kiss King

https://backpack.tf/profiles/76561198135821092#!/compare/1536105600/1536364800

https://backpack.tf/profiles/76561198219980724#!/compare/1536105600/1536364800

Don’t know if I fucked up the premium search, but this appears to be the only one of its kind at the moment, so this may be the only one with sales.

Green Energy Sola Topi:

https://backpack.tf/suggestion/5bc32a4144325a198219cd56

Sales at:

22 (2x)

No current sellers, I think.

Going with 22 flat.