Resuggestion, thanks toFoamy for the info!

Sale 1:

https://backpack.tf/profiles/76561198006544512#!/compare/1535673600/1535760000

https://backpack.tf/profiles/76561198044194680#!/compare/1535673600/1535760000

Sold for Aussie Frontier(12) + craft hats + Strange Skinned Air Strike

Strike Mini:

https://backpack.tf/profiles/76561198044425376#!/compare/1532044800/1532563200

Sold for ~2 keys in items (black box + Shooting Star)

Total is 14 keys

Sale 2:

https://backpack.tf/profiles/76561198044194680#!/compare/1535932800/1536192000

https://backpack.tf/profiles/76561198142320206#!/compare/1535846400/1535932800

Sold for Grail Fresh Brewed(9.5)

Sale 3:

https://backpack.tf/profiles/76561198061779536#!/compare/1535500800/1535846400

https://backpack.tf/profiles/76561198848059175#!/compare/1535760000/1535846400

Sold for P Fetti Powdered.

Use there.

Sale 4

https://backpack.tf/profiles/76561198848059175#!/compare/1536624000/1536710400

https://backpack.tf/profiles/76561198164651434#!/compare/1536537600/1536710400

Sold with 2 keys for Tesla Powdered

used there.

Sale 5:

https://backpack.tf/profiles/76561198177038371#!/compare/1539475200/1539561600

https://backpack.tf/profiles/76561198137048062#!/compare/1538784000/1539475200

Sold for 13 keys

Sale 6:

https://backpack.tf/profiles/76561198147323173#!/compare/1534636800/1537488000

Sold for 11 keys

Sale 7:

https://backpack.tf/profiles/76561198404800996#!/compare/1534118400/1534550400

https://backpack.tf/profiles/76561198117135650#!/compare/1534291200/1534550400

Sold for 19 keys

Sale 8:

https://marketplace.tf/items/30969;5;u58

Sold for 20 USD

Keys at 1.90 USD

Total is 10.53 keys

Total sales @:

9.5, 10.53, 11, 13, 14, 19 keys

https://i.imgur.com/rpzaGQz.jpg

17 has been listed for 2 weeks+

Calling 19 the outlier,

Foamy's Part:

9.5 feels low here especially given that it's a tauntsale (one which heavily dropped after the trade was made). I would not rely on that here and make this 11-14

Taking 11 - 14 keys