Sale #1:

http://www.tf2outpost.com/trade/28266579

http://backpack.tf/profiles/76561198148186873#!/compare/1466294400/1466553600

http://backpack.tf/profiles/76561198088707185#!/compare/1466467200/1466553600

Smoking Tsarboosh (13.5) + DP Big Elfin Deal (14) + ~1 key in other items

13.5 + 14 + 1 = 28.5 keys; B/O was 27 keys

Sale #2:

Quicksale for 17 keys

http://backpack.tf/profiles/76561198083063071#!/compare/1466208000/1466294400

Sale #3:

Sold with 3 keys for Ooze Scotch (outdated at 27-31 keys)

http://backpack.tf/profiles/76561198059711922#!/compare/1469059200/1469923200

No other recent sales for the Ooze Scotch, but using its old value would put the sale at 26 keys. This sale should be supportive.

Sale #4:

Sold with 5 keys for Searing Toque (outdated at 28 keys)

http://backpack.tf/profiles/76561198159262475#!/compare/1469923200/1470009600

Toque has a B/O of 24 keys here - http://www.tf2outpost.com/trade/28389918

24 - 5 = 19 keys

Sale #5:

Sold for KaW Tartan Tyrolean (24 mini below)

http://backpack.tf/profiles/76561198133677583#!/compare/1466035200/1466121600

KaW Tartan Tyrolean:

http://www.tf2outpost.com/trade/28254216 - Seller of Tartan wanted 24 keys

http://backpack.tf/profiles/76561198133677583#!/compare/1466121600/1466294400 Sold for Time Warp Counterfeit Billycock (outdated at 28). The Billycock should easily be 24+ so the value of the Tartan should be around 24.

Which puts the Scotch at 24 keys from this sale since it was a 1:1 trade.

Sale #6:

Sold with 5 keys for Vivid Marauder (outdated at 27)

http://www.tf2outpost.com/trade/28211584

http://backpack.tf/profiles/76561198061489334#!/compare/1464998400/1465084800

http://backpack.tf/profiles/76561198147357690#!/compare/1465084800/1465257600

Using this to update the Marauder

Conclusion:

Sales are at 17, 19, 24, 26, and 27. Gonna exclude the lower sales and make a range of 24-27 keys.