Re-suggesting, using last month.

Sale 1:

Sold for Aussie Axtinguisher (~6.75 at the time) + ~2.25 keys in items

No outpost

Seller: https://backpack.tf/profiles/76561198088731324#!/compare/1523750400/1523923200

Buyer: https://backpack.tf/profiles/76561198053758441#!/compare/1523404800/1523923200

Axtinguisher hasn’t been updated since pyro update: https://backpack.tf/suggestion/5acdc41044325a53cc65dd62 (Snapshots suggest a range of ~6.3-7.3, closest one at the time of sale)

X = 9

Sale 2:

Sold for 8 keys

Seller: https://backpack.tf/profiles/76561198061489334#!/compare/1523491200/1523664000

Buyer: https://backpack.tf/profiles/76561198036270946#!/compare/1523577600/1523664000

X = 8

Sale 3:

Sold for 6 keys

Seller: https://backpack.tf/profiles/76561198071132357#!/compare/1522454400/1522540800

Buyer: https://backpack.tf/profiles/76561198220465784#!/compare/1522368000/1522540800

X = 6

Sellers:

7 keys:

http://www.tf2outpost.com/trade/29632425

Offers:

http://www.tf2outpost.com/trade/29590946

http://www.tf2outpost.com/trade/29636242

And another seller at ~6.5 keys on the SCM: https://i.imgur.com/GXWFxC0.png

Sales at:

6

8

9

9 is too high, according to Mindacos.

Going with 6-8.