Gonna fix this one.

Sale 1: https://backpack.tf/profiles/76561198110133394#!/compare/1501632000/1501718400 - 17 pure, QS.

Sale 2: https://backpack.tf/profiles/76561198359449894#!/compare/1501718400/1501804800 - Resold instantly for a Strange Specialized Killstreak Australium Medi Gun (23 keys)

http://i.imgur.com/Erpe0Go.png - Quicksold.

Sale 3: https://backpack.tf/profiles/76561198293778105#!/compare/1501804800/1501891200 - Bulky and quicksold for 23 above, calling this sale an outlier.

Sold with a Strange Specialized Killstreak Australium Flame Thrower (14 keys) + a Taunt: Pool Party (3 keys) for a Clean Scorching Flames Bloke's Bucket Hat (40 keys)

40 - (14 + 3) = 23

Sale 4: https://backpack.tf/profiles/76561198252902596#!/compare/1500940800/1501027200

Sold for a Clean Holy Grail Taunt: Battin' a Thousand (23 keys) + 2 keys in sweets

23 + 2 = 25

Mini for the Battin: https://backpack.tf/profiles/76561198009272632#!/compare/1500076800/1500163200 - 22,5 keys pure

Sellers on the Battin: http://i.imgur.com/OoXAbWB.png

Sale 5: https://backpack.tf/profiles/76561198113853563#!/compare/1501113600/1501200000

Sold for a Clean Searing Plasma Stout Shako (in date, but taking 22) + 5 pure

22 + 5 = 27

http://i.imgur.com/raJ0gLG.png - Taking 22.

Sale 6: https://backpack.tf/profiles/76561198072087574#!/compare/1501200000/1501286400 - 7 of the keys indeed match, Marty.

https://backpack.tf/profiles/76561198119629032#!/compare/1500940800/1501286400 - Other side aswell, shrug.

Sold with 7 pure for a Clean Tesla Coil A Hat to Kill For (34 keys)

34 - 7 = 27

Mini for the Hat to Kill For: https://backpack.tf/profiles/76561198061489334#!/compare/1501718400/1501804800 - PKS Aussie Scatter, 31

+

https://backpack.tf/profiles/76561198061489334#!/compare/1501372800/1501459200 - Sold with 3k of sweets for a Vivid Drill, ~37

Taking 31-37. (Credits to Marty for the mini on Hat to Kill For).

Sale 7: https://backpack.tf/profiles/76561198038391383#!/compare/1497312000/1497484800

Sold for a Clean Disco Beat Down Voodoo JuJu (Slight Return) (17 keys) + Strange Killstreak Festive Rocket Launcher (10 keys) + roughly 3 keys in adds + 8 pure

17 + 10 + 3 + 8 = 38

http://i.imgur.com/iIPk8Wl.png - Calling this sale an outlier.

Sale 7: https://backpack.tf/profiles/76561198179587659#!/compare/1499904000/1500249600 - Use on Buckaroos.

Sales: 25, 27 and 27. Going with a range of 25-27.