Aye! First suggestion c: Please dont kill me if i did anything wrong.

Here we go!

Sale #1

Sold for 45 keys + Pro ks Aussy Black Box (1 month ago)

The math: 45+42*0.9=83 which at that time was 7 buds (83/12=6.9, rounding to 7)

Black Box:

http://backpack.tf/classifieds/?item=Black%20Box&quality=11&tradable=1&craftable=1&australium=1

Pro ks is right now in range of 31-42≈37.

At the sales time, a stock bb was at 25. That means a pro ks would've been in the range of roughly 42.

Sellers trade: http://www.tf2outpost.com/trade/24581314

Buyer aproving what he bought for: http://i.imgur.com/NkMFqr5.png

Aproved from the seller: http://i.imgur.com/d5ClBzt.png

Sale #2

(Credit to: King FireHD)

Sold for a Spellbound Furious Fukaamigasa (1 month ago)

8.8*0.9=7.9 rounding to 8

Sellers trade: http://www.tf2outpost.com/trade/24855098

The sellers backpack before:

http://backpack.tf/profiles/76561198034421056?time=1422950400

After:

http://backpack.tf/profiles/76561198034421056?time=1423036800

The buyer backpack before:

http://backpack.tf/profiles/76561198038866814?time=1422950400

After:

http://backpack.tf/profiles/76561198038866814?time=1423036800