Using last 2 months.

Sale 1:

Sold for 7 keys

Seller: https://backpack.tf/profiles/76561198140287487#!/compare/1522368000/1524873600

Buyer: https://backpack.tf/profiles/76561197962488873#!/compare/1522195200/1525046400

X = 7

Sale 2:

Sold for ’72 Battin’ a Thousand (Mini at ~5.5 below) + Cute suit

http://www.tf2outpost.com/trade/29602015 - B/O of ~5.5

Seller: https://backpack.tf/profiles/76561198146326272#!/compare/1522281600/1522368000

Buyer: https://backpack.tf/profiles/76561198110005453#!/compare/1522022400/1522368000

X = 5.5 (Capped by B/O)

Sale 3:

Sold for 5 keys + small amount of ref

Seller: https://backpack.tf/profiles/76561198069463421#!/compare/1521417600/1521590400

Buyer: https://backpack.tf/profiles/76561198089253101#!/compare/1521417600/1521504000

X = 5

Sale 4:

Sold for Orbiting Fire Hetman + Strange Spec. KS Ambassador (~0.5)

No outpost

Seller: https://backpack.tf/profiles/76561198238025864#!/compare/1524355200/1524441600

Buyer: https://backpack.tf/profiles/76561198162638368#!/compare/1524355200/1524441600

Way too high, excluding.

’72 Battin’ Mini:

Sold for 5 keys + 15 ref

Seller: https://backpack.tf/profiles/76561198308819102#!/compare/1522627200/1522713600

Buyer: https://backpack.tf/profiles/76561198055994779#!/compare/1522713600/1522800000

Bot.tf confirms: https://i.imgur.com/2spDCI4.png

X = 5.5

(Will do a full suggestion once I get around to it, ’72 is next after gains)

Sellers:

~5.7 keys:

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

https://backpack.tf/item/6504616662

https://backpack.tf/item/4417739771

6 keys:

https://i.imgur.com/weg0kMr.png

https://backpack.tf/item/4404487986

10 keys:

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

https://backpack.tf/item/4513384479

13 keys:

http://www.tf2outpost.com/trade/29539929

Sales at:

5

5.5

7

Several sellers for significantly less than 7 keys, excluding 7.