Sale 1: ~25 keys (capper was not involved according to history)

https://backpack.tf/profiles/76561198126142303#!/compare/1514851200/1514937600

Sale 2: 23 keys pure

https://backpack.tf/profiles/76561198126142303#!/compare/1516406400/1516492800

Sale 3: Untraceable

https://backpack.tf/profiles/76561198145823187#!/compare/1513900800/1514246400

Buyers at 23.X https://i.imgur.com/Kn9Ar5x.png

Suggesting flat 25

Sale 4: Sold for 58.86 USD on mp.tf. 1 key = 1.90 USD --> 31 keys

https://marketplace.tf/items/102;5;u9

Sale 5: 25 keys pure

https://backpack.tf/profiles/76561198136469690#!/compare/1517529600/1517616000

Sale 6: 25.5 keys pure

https://backpack.tf/profiles/76561198071724100#!/compare/1517270400/1517529600

Sale 7: Bulk

https://backpack.tf/profiles/76561198136469690#!/compare/1516924800/1517011200

Sales at 23, 25, 25, 25.5; mp.tf sale at 31.

Calling the mp.tf sale an outlier and rounding 25.5 down to 25 which seems to be the common trading point. 23 remains low.