Sale 1:

http://www.tf2outpost.com/trade/24559770

backpack before: http://backpack.tf/profiles/76561198059919379?time=1421481600

backpack after:

tavish + 9 keys for Miami Nights Sergeant's Drill Hat (2.05)

Trade occurred on the 17th of January, buds were 15 keys: http://backpack.tf/vote/id/54b489deb98d88d9018b4623

x + 0.6 = 0.9(2.05) = 1.245 rounded down to

1.2 buds

Sale 2:

Smoking Tavish crown + 17 keys for spec ks festive rocket launcher

backpack before: http://backpack.tf/profiles/76561198097976394?time=1424246400

backpack after: http://backpack.tf/profiles/76561198097976394?time=1424332800

x + 1.4 = 2.6

x = 1.2 buds

specialized kill streak festive rocket launcher mini:

sold for 31 keys

http://www.tf2outpost.com/trade/25121653

backpack before: http://backpack.tf/profiles/76561198116166767?time=1423900800

backpack after: http://backpack.tf/profiles/76561198116166767?time=1424332800