Well, this one took a while.

Overpay applied on all sales.

Sales:

http://i.imgur.com/NQBGBGi.png - Sold for G.E Bicorne (4.9) + 1 bud

Total sale value: 5.9

http://i.imgur.com/2bHznYQ.png - Sold together with 4 keys for a cauldron towering pillar (Outdated and duped, can't use)

http://www.tf2outpost.com/trade/21313888 - Sold for Planets BOA (~5.1) + ~10 keys in items (~0.5).

Total sale value: 5.6

No overpay since BOA was offered

http://backpack.tf/profiles/76561198047441117?time=1405234800 > http://backpack.tf/profiles/76561198047441117?time=1405321200 - Sold for Duped Hearts Milkman + 2 buds pure (Outdated and duped, can't use but it should fit in the range either way)

http://backpack.tf/profiles/76561198086405271?time=1405148400 > http://backpack.tf/profiles/76561198086405271?time=1405234800 - Sold together with 2 keys and ~11 keys in items (~0.6) for circling heart bonk helm (2.7) + nut's bonk boy (1.8)

Total sale value: 5.1

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Mini on Bicorne:

http://i.imgur.com/Q0RZivh.png - Sold for Harvest Moon Bonk Helm (4.1) + 25 keys (1.3)

Total sale value: 5.4

Mini on BOA:

http://backpack.tf/profiles/76561198089029499?time=1406444400 > http://backpack.tf/profiles/76561198089029499?time=1406617200 - Sold for Peace Gilded Guard (~4.1) + 1 bud

Total sale Value: 5.1

Mini on bonk helm:

http://www.tf2outpost.com/trade/21765853 - B\O 3

http://www.tf2outpost.com/trade/21790595 - Offered SS Yellow Belt + few keys in sweets (Should be close enough too 3)

Putting a safe value of 3 on that one.

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Conclusion: 1 sale at 5.1, 1 at 5.6 and 1 at 5.9

Setting a range of 5.1-5.9