Sale #1

http://www.tf2outpost.com/trade/20394887 asking for 3.5

Had a C/O for 3 pure but he is f2p o_o

Sold for 1.6

Buyer's backpack before

http://backpack.tf/profiles/76561198080480265?time=1403161200

Buyer's backpack after

http://backpack.tf/profiles/76561198080480265?time=1403247600

Seller's backpack before

http://backpack.tf/profiles/76561198081527302?time=1403161200

Seller's backpack after

http://backpack.tf/profiles/76561198081527302?time=1403247600

Maybe was quicksold (2 weeks ago and finished 2 weeks ago )

Sale #2

http://www.tf2outpost.com/trade/19967459 asking for ~2

Sold for stormy storm stg drill + 7 keys

Buyer's backpack

Before

http://backpack.tf/profiles/76561198040124852?time=1400742000

After

http://backpack.tf/profiles/76561198040124852?time=1401087600

2.1*0.9 = 1.9 Buds

7 keys = 0.4 Buds

1.9 + 0.4 = 2.3 buds

1 month ago and sold in days

Sale #3

http://www.tf2outpost.com/trade/20280752

Backpack's Seller

Before

http://backpack.tf/profiles/76561198070794997?time=1402729200

After

http://backpack.tf/profiles/76561198070794997?time=1402988400

Sold for orb planet modest pile of hat (2.5) + 4 keys

2.5*0.9 = 2.3~

4 keys = 0.23 Buds

= 2.53 ~2.5

Sold in few days too

Anyway this is my first unu suggestion