Sellers:

http://imgur.com/a/E7udr - b/o: 34 keys (1 month)

Sold:

http://www.tf2outpost.com/trade/28858967

http://www.tf2outpost.com/trade/28847514

http://www.tf2outpost.com/trade/28841104

https://backpack.tf/profiles/76561198080179568#!/compare/1491264000/1491350400

https://backpack.tf/profiles/76561198133042081#!/compare/1491264000/1491350400 - sold for 28 keys

Credits to K1ng

http://www.tf2outpost.com/trade/28881914

https://backpack.tf/profiles/76561198113188320#!/compare/1492387200/1492473600

https://backpack.tf/profiles/76561198171944770#!/compare/1490918400/1492387200 - sold for 2 Max's Severed Head (38) = 38 keys (outlier)

https://backpack.tf/profiles/76561198170033247#!/compare/1492128000/1492387200 - bulk

http://www.tf2outpost.com/trade/29208156

https://backpack.tf/profiles/76561198068085798#!/compare/1496448000/1496534400 - sold for Collector's Professional Killstreak Original (22) = 22 keys (quicksold)

http://backpack.tf/profiles/76561197982127154#!/compare/1492473600/1492560000

http://backpack.tf/profiles/76561198064792880#!/compare/1492560000/1492819200 - sold for 28 keys

Credits to K1ng

https://backpack.tf/profiles/76561198133042081#!/compare/1491955200/1492128000

https://backpack.tf/profiles/76561198090956917#!/compare/1491955200/1492128000 - sold for 20~ (low)

Credits to K1ng

http://backpack.tf/profiles/76561198064792880#!/compare/1496102400/1496275200 - sold for Vivid Liq Lid = should be used to update that

Credits to K1ng

Conclusion:

sales at 20, 22, 28, 28, 38

seller at 34

taking 28 keys

Previous Suggestion: http://backpack.tf/suggestion/593ab0900e2cad508d06207f