Waited for a third sale, one has occurred so here it goes:

Sale 1:

backpack before: http://backpack.tf/profiles/76561198038666068?time=1423641600

backpack after: http://backpack.tf/profiles/76561198038666068?time=1423728000

1:1 with a massed flies soldier's stash (6.4) ; Gilded was offered on it thus no overpay calculated

6.4

Sale 2:

http://www.tf2outpost.com/trade/24937980

Backpack history was not clear and thus contacted previous owner, said he sold it for 5 buds and I've confirmed that below:

backpack before: http://backpack.tf/profiles/76561198028687191?time=1423036800

backpack after: http://backpack.tf/profiles/76561198028687191?time=1423209600

Had a Bud + 27 keys in inventory after trade

The other 24 keys were traded for a miami nights modest metal pile of scrap:

backpack before: http://backpack.tf/profiles/76561198104628963?time=1422950400

backpack after: http://backpack.tf/profiles/76561198104628963?time=1423123200

Thus a total of a bud + 51 keys

Trade occured on the 6th of december

Buds were 12.5 back then: http://backpack.tf/vote/id/54d25e46b98d889f458b4f31

thus 1 + 4.08 =

5.08 rounded up to 5.1 However taking it as 5 Due to Trade B.O

Sale 3:

http://www.tf2outpost.com/trade/25140777

backpack before: http://backpack.tf/profiles/76561198059880962?time=1424592000

backpack after: http://backpack.tf/profiles/76561198059880962?time=1424678400

1;1 with a burning flames scotch bonnet (5.5). It was offered on the bonnet (confirmed with owner)

Thus 5.5