Resuggest at 5 flat as suggested by polar.

Sale #1: 5 buds (round up)

http://www.tf2outpost.com/trade/22090468

Sold for a Terror-Watt Infernal Impaler + Bill’s Hat

Backpack Before: http://backpack.tf/profiles/76561198057562173?time=1408604400

Backpack After: http://backpack.tf/profiles/76561198057562173?time=1408690800

5.1 * 0.9 = 4.59 buds + 4 keys = 4.9 buds

Sale #2: confusing support sale

http://www.tf2outpost.com/trade/22090072

Sold with a max for a duped Kill-a-Watt Brotherhood of Arms?

Backpack Before: http://backpack.tf/profiles/76561198057562173?time=1408258800

Backpack After: http://backpack.tf/profiles/76561198057562173?time=1408345200

Duped Kill-a-Watt Brotherhood of Arms Mini:

http://www.tf2outpost.com/trade/21805681

Got an offer of ~15 buds, just going to assume full value?