Counter, more sales have happened so 4 flat is not right.

http://www.tf2outpost.com/trade/20965224

http://backpack.tf/profiles/76561198046419339?time=1404543600 / http://backpack.tf/profiles/76561198046419339?time=1404630000

Added 8 keys for a Cloud 9 Cannonball (~4.1)

~3.7

http://www.tf2outpost.com/trade/21281525

http://backpack.tf/profiles/76561198099238713?time=1405407600 / http://backpack.tf/profiles/76561198099238713?time=1405494000

Sold for a Bubbles TC (~3) + 1 bud

~4 buds

http://www.tf2outpost.com/trade/21258222

http://backpack.tf/profiles/76561198082190089?time=1405407600 / http://backpack.tf/profiles/76561198082190089?time=1405494000

Added a Bill's and a few items worth ~12 keys* for a Beams FR-0 + Stormy Rag (~5.7)

http://steamcommunity.com/market/listings/440/Professional%20Killstreak%20Festive%20Rocket%20Launcher - being ~$25 or 10 keys

outlier

http://www.tf2outpost.com/trade/21274249

http://backpack.tf/profiles/76561198099238713?time=1405407600 / http://backpack.tf/profiles/76561198099238713?time=1405494000

Sold + set (roughly 12ish keys in items) + other 2 keys in items for a Blizz TC (~4.3)

~3.6 buds

http://www.tf2outpost.com/trade/21151308 - sold for csgo stuff

Selling:

http://www.tf2outpost.com/trade/21011080 - 4

http://www.tf2outpost.com/trade/21735919 - 4