Sale 1:

http://www.tf2outpost.com/trade/23647402

Sold 1: 1 for an aces high nunhood (2.05)

backpack before: http://backpack.tf/profiles/76561198143486952?time=1416729600

backpack after: http://backpack.tf/profiles/76561198143486952?time=1416902400

2.05 x 0.9 =

1.845 rounded down to

1.8

Sale 2:

http://www.tf2outpost.com/trade/24188836#latest

Sold for 24 keys + Salvaged mann co crate #50 (worth about 6 keys)

24 + 6 x 0.9 = 29.4

29.4/12.5 =

2.35 buds rounded up to

2.4

Proof: http://postimg.org/image/60wahcz3b/

Mini on the crate:

http://steamcommunity.com/market/listings/440/Salvaged%20Mann%20Co.%20Supply%20Crate%20Series%20%2350 SCM starting from 12 euros+ (over 6 keys)

http://www.tf2outpost.com/trade/14464126 - B.O of 7 keys - Sold at least 4 of them in the last 3 months from the comments

http://www.tf2outpost.com/trade/24152949 - B.O of 8 keys