Sales

a) http://www.tf2outpost.com/trade/23088821

Seller's backpack

before http://backpack.tf/profiles/76561198100532201?time=1422691200

after http://backpack.tf/profiles/76561198100532201?time=1422777600

1 bud pure + festive shotgun

festive shotgun : http://backpack.tf/item/3428281350

shotgun was 4 keys at the moment

buds were 13 keys , 4/13 = 0.3 = 0.3 * 0.9 (overpay) = 0.27 + 1 pure = 1.27 rounding up to 1.3

b) http://www.tf2outpost.com/trade/25092109 as set

c) http://www.tf2outpost.com/trade/24314332 as set

d) http://www.tf2outpost.com/trade/24756148

buyer's backpack

before http://backpack.tf/profiles/76561198100532201?time=1422000000

after http://backpack.tf/profiles/76561198100532201?time=1422086400

1:1 for a festive sniper rifle

history : http://backpack.tf/item/619854745

sniper rifle was 20 keys at the time

buds were 14 keys

20/14 = 1.42 *0.9 = 1.28 = 1.3

current b/o

http://www.tf2outpost.com/trade/25093010 1.3 buds