The Sale:

Sold with ~2.5 keys in items for Aces High Bolted Bicorne (Mini at 11 below)

No outpost

Seller: https://backpack.tf/profiles/76561198360380273#!/compare/1522022400/1522108800

Buyer: https://backpack.tf/profiles/76561198043882860#!/compare/1521763200/1522022400

Only traceable, valid sale I could find within the last 2 months.

X = 8.5

Aces High Bolted Bicorne Mini:

Sold for 11 keys + cheap cosmetic

Seller: https://backpack.tf/profiles/76561198112516663#!/compare/1521936000/1522022400

Buyer: https://backpack.tf/profiles/76561198043882860#!/compare/1521763200/1522022400

X = 11

Sellers:

~8.99 keys:

https://i.imgur.com/Ed3qnQG.png

https://backpack.tf/item/6548629524

9 keys:

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

https://backpack.tf/item/5802910986

11 keys:

https://i.imgur.com/eLKUd75.png

https://backpack.tf/item/6605595640

20 keys:

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

https://backpack.tf/item/6608590255

None on SCM

Sales at:

8.5

Going with 8.5 flat.

New seller at ~7.73 keys:

https://i.imgur.com/2FMYLg0.png

https://backpack.tf/item/6015308079

will keep an eye on it.