Sale 1:

https://backpack.tf/profiles/76561198310144372#!/compare/1522627200/1522713600

https://backpack.tf/profiles/76561198133672650#!/compare/1522627200/1522713600

Sold for 25 pure.

Sale 2:

https://backpack.tf/profiles/76561198133672650#!/compare/1523232000/1523318400

https://backpack.tf/profiles/76561198344933095#!/compare/1523232000/1523318400

Sold for 23 keys + 6 ref

Sale 3:

https://backpack.tf/profiles/76561198344933095#!/compare/1523923200/1524009600

https://backpack.tf/profiles/76561198280678753#!/compare/1523923200/1524009600

Sold for 26 keys.

Sale 4:

https://backpack.tf/profiles/76561198280678753#!/compare/1525564800/1525651200

https://backpack.tf/profiles/76561198141810177#!/compare/1525392000/1525737600

Sold for Speck KS Aussie Grenade Launcher(13.8) + Aussie Tomi(11.3) + 72 Shred(13.5) + 2 keys.

Total is 13.8 + 11.3 + 13.5 + 2 = 40.6 keys

http://www.tf2outpost.com/trade/29623822

B/O of 30 keys.

Capping there.

Sale 5:

https://backpack.tf/profiles/76561198119634686#!/compare/1522281600/1522368000

https://backpack.tf/profiles/76561198367266297#!/compare/1521849600/1522368000

Sold for 26 keys +10 ref

Sale 6:

https://backpack.tf/profiles/76561198367266297#!/compare/1522713600/1522886400

https://backpack.tf/profiles/76561198242679644#!/compare/1522800000/1522886400

Sold for Pro KS Aussie Knife(26.82)

Sale 7:

https://backpack.tf/profiles/76561198242679644#!/compare/1524009600/1524096000

Sold for TFL Hallmark + 5.83 keys in sweets.

Use there.

Sale 8:

https://backpack.tf/profiles/76561198144402305#!/compare/1524960000/1525132800

https://backpack.tf/profiles/76561198311426014#!/compare/1525046400/1525132800

Sold for 29 keys.

Sale 9:

https://backpack.tf/profiles/76561198144402305#!/compare/1524355200/1524614400

Sold for Lantern Titanium Tyrolean.

Use there.

Sale 10:

https://backpack.tf/profiles/76561198002757046#!/compare/1523664000/1523750400

https://backpack.tf/profiles/76561198086261861#!/compare/1523750400/1525132800

Using there.

Total sales @:

23.22, 25, 26, 26.36, 26.82, 29, 30

https://i.imgur.com/3dgPDlk.jpg

Sellers at 27 - 30, 30 unsold for 2 months.

Buyers up to 24 keys.

Hesitantly calling 25 an outlier( too close to sellers) and 30 an outlier(unsold for 2 months)

Taking 26 - 29 keys.