Sale #1:

Sold for 10 keys + Pro Strange Third Degree (~2 keys)

http://i.imgur.com/VheI4Kf.png

http://backpack.tf/profiles/76561198233504112?time=1451635200&compare=1451894400

10 + 2 = 12 keys

Sale #2:

Sold for... stuff

http://backpack.tf/profiles/76561198146903184?time=1453363200&compare=1453622400

http://backpack.tf/profiles/76561198233504112?time=1452931200&compare=1453622400

The seller has Escrow so this can't be tracked very easily.

http://www.tf2outpost.com/trade/27733816 B/O was 11 keys, I'll include this in the range.

Sale #3:

Sold for Orbiting Fire Escorter (12) + 2 keys

http://www.tf2outpost.com/trade/27750475

http://backpack.tf/profiles/76561197998322837?time=1453536000&compare=1453708800

12 + 2 = 14 keys, but B/O was 10 keys

It sold within ~12 hours at this B/O, and the sale was actually much higher. This should support the other sales.

Previously listed for 11 keys: http://www.tf2outpost.com/trade/27750208