Let's just do all of these.

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Sales

http://www.tf2outpost.com/trade/24607530 26 keys, Spec KS

http://www.tf2outpost.com/trade/24679741 27 keys, Spec KS

http://www.tf2outpost.com/trade/24597334 26 keys, Spec KS

http://i.gyazo.com/d06dd4ce771bc2a1cde77404595f0bab.png 26 keys

http://i.gyazo.com/c4dcc45694b7d7542440b974d3c4fdaf.png >26 keys

http://i.gyazo.com/d951ba9cd01ede6fb926162b8f79e764.png ^

http://i.gyazo.com/937c0f8a12835ea0e46b98d0af039a45.png ^

http://i.gyazo.com/d7e1105ec729c97fa7c12e73edd8ba59.png 30 keys

Classified:

http://i.gyazo.com/99cfe7e0cc29a0bbba5389fa7b9f0cf2.png

Sellers:

http://www.tf2outpost.com/trade/24676571 27 keys

http://www.tf2outpost.com/trade/24722035 26 keys

Buyers (credits to WoodenHouse):

http://www.tf2outpost.com/trade/24487107 25 keys

http://www.tf2outpost.com/trade/24496514 24 keys

http://www.tf2outpost.com/trade/24678953 24 keys

http://www.tf2outpost.com/trade/21333252 24 keys

http://www.tf2outpost.com/trade/24649781 24 keys

http://www.tf2outpost.com/trade/24696573 24 keys

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Keeping 25 keys in range because there is only 1 buyer at 25 and multiple Specialized Killstreak sales at 26.

http://i.imgur.com/RF3ZMDs.png 27 keys, Spec KS

Buyout of 26 though.