Need it for another suggestion. Better than nothing.

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Sale #1 21st - 22nd of May

http://backpack.tf/profiles/76561198126993284?time=1432191600 before

http://backpack.tf/profiles/76561198126993284?time=1432278000 after

Sold for: Kill-a-Watt Brain bucket(~24) + Spec.KS S.F Eyelander (~2.5 by lazy mini) + KS F.Sticky(~0.6) + ~0.8 keys in cosmetics. 24+2.5+0.6+0.8=27.9*0.9 = 25.11 -> 25

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Sale #2 24th - 25th of May

http://backpack.tf/profiles/76561198079026982?time=1429858800 before

http://backpack.tf/profiles/76561198079026982?time=1429945200 after

Sold for Mem Leak Glengarry(25 after a mini) + 35 refined(~1.8) 25*0.9 = 22.5 + 1.8 = 24.3 -> 24

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I'll try to use this as a mini for bonnet. Credits to Sugarcube

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http://www.tf2outpost.com/trade/25992017 Sold for Steaming Hermes + 15.5 keys of sweets

B/O for Glen was 25

Hermes had no trade

X = 12*0.9 + 15.5*0.9

X = 25

Hermes https://backpack.tf/item/656874059

Sweets http://gyazo.com/a19707cda6d4831db40fe8c0f80b79ba

Bonnet https://backpack.tf/item/1931442945

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Sale #... Unusable by itself, used here as a note to update Robin. || 4th - 5th of June

http://backpack.tf/profiles/76561198122259040?time=1433464437 before

http://backpack.tf/profiles/76561198122259040?time=1433487600 after

Sold for EOF Robin+4 keys pure

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Conclusion: Got two sales, 24 and 25. Yes, that might be high, but i have nothing more to work with, all other sales are either too old or complex.