Sale 1

https://backpack.tf/profiles/76561198042889054#!/compare/1496275200/1496448000

KaW Whoopee (19) + Blizz Ushanka (~26) = 45 keys

Sale 2

https://backpack.tf/profiles/76561198015384426#!/compare/1498608000/1498694400

http://www.tf2outpost.com/trade/29250053

26 pure

Sale 3

https://backpack.tf/profiles/76561198217691553#!/compare/1494547200/1494633600

PE Jeepcap (44)

http://www.tf2outpost.com/trade/28901633 - b/o of 40, capping

Sale 4

https://backpack.tf/profiles/76561198068697940#!/compare/1493424000/1493510400

C.Heart Amassment of hats (39)

Sale 5

https://backpack.tf/profiles/76561198068697940#!/compare/1493251200/1493337600

C.Heart DeGroot (18 days unsold @30: http://screenshot.sh/m7ysejXIzkpEn ) + 1 key = 31, low

Sale 6

https://backpack.tf/profiles/76561198168625615#!/compare/1492992000/1493078400

Better use on Exclusive

Sale 7

https://backpack.tf/profiles/76561198047099191#!/compare/1492992000/1493251200

https://backpack.tf/profiles/76561198047099191#!/compare/1492992000/1493251200

Vivid Grimm (26) + p.fetti Buccaneer's (14) = 40 keys

Sale 8

https://backpack.tf/profiles/76561198297110919#!/compare/1497830400/1497916800

34 pure, reselling for 3 days @34: http://screenshot.sh/mGDHLP3IqPKHh

Summary

Sales @26, 34, 39, 40, 40, 45

A lot of low sales and sellers - according to this, taking 45 high

26 sounds most like a qs

Taking 34-40