Sale 1:

Sold for 25 keys

Seller: https://backpack.tf/profiles/76561198072240925#!/compare/1515715200/1515801600

Buyer: https://backpack.tf/profiles/76561198146304191#!/compare/1515542400/1515801600

X = 25

Sale 2:

Sold for Kill-a-Watt Front Runner (Mini at 23 below)

http://www.tf2outpost.com/trade/29495569 - B/O of 22

Seller: https://backpack.tf/profiles/76561198115686239#!/compare/1514505600/1514592000

Buyer: https://backpack.tf/profiles/76561198285109227#!/compare/1514419200/1514592000

X = 22 (Capped by B/O)

Kill-a-Watt Front Runner Mini:

Sale 1:

Sold for Australium Scattergun (~24 at the time) + 2 keys

No outpost

Seller: https://backpack.tf/profiles/76561198250306796#!/compare/1512864000/1512950400

Buyer: https://backpack.tf/profiles/76561198285109227#!/compare/1512864000/1512950400

X = 26

Sale 2:

Sold for 23 keys

Seller: https://backpack.tf/profiles/76561198002186909#!/compare/1515542400/1515628800

Buyer: https://backpack.tf/profiles/76561198193663305#!/compare/1515456000/1515628800

X = 23

Sale 3:

Sold for Stormy Bonk Helm + Steaming Merryweather + 3 keys

http://www.tf2outpost.com/trade/29448922 - B/O of 20

Seller: https://backpack.tf/profiles/76561198051261304#!/compare/1511049600/1511136000

Buyer: https://backpack.tf/profiles/76561198136944826#!/compare/1511136000/1511222400

X = 20 (Capped by B/O)

Taking 23.

Sellers:

55 keys:

https://i.imgur.com/YA5MYNC.png

https://backpack.tf/item/3121898878

3 sellers on Marketplace.tf, going as low as ~30 keys worth

https://marketplace.tf/items/1116;5;u3012

Sales at:

22

25

Going with 22-25.

https://i.imgur.com/wHp07vU.png

https://backpack.tf/item/4936490294

seller at 20, guess i'm gonna have to wait and see if it sells.