Bye Surs, feel free to come back at any time. I'm sure the bp.tf community will welcome you!

Sale 1: Sold for 20 keys

http://backpack.tf/profiles/76561198148811138#!/compare/1458198000/1458284400

http://backpack.tf/profiles/76561198148811138?time=1458284400

Sale 2: Not trackable

http://backpack.tf/profiles/76561198254614446#!/compare/1459555200/1459641600

http://backpack.tf/profiles/76561198211717085#!/compare/1459555200/1459728000

Sale 3: Sold with 6 keys for Potassium Bonnet[15 keys]

http://www.tf2outpost.com/trade/28119468

https://gyazo.com/f5629e2b5cea3c2e826837f9862d2655.png

15-6=9 keys

Sale 4: Not trackable

http://backpack.tf/profiles/76561198209947264#!/compare/1458802800/1458864000

http://backpack.tf/profiles/76561198181119767#!/compare/1458543600/1458630000

Sale 5: Also untrackable

http://backpack.tf/profiles/76561198181119767#!/compare/1458630000/1458716400

Buyer at 9 keys

http://www.tf2outpost.com/trade/27804899

2 sellers at 15 in classes:

https://i.gyazo.com/4a3515931bece1b093ecd7c962e37fee.png

ALL credit for this suggestion goes to Surs (known right know as JBlue).