This wasn't frickin' easy.

Sales

1) Sold for.... something

Ninja seller: http://backpack.tf/profiles/76561198092256084?time=1439967600 (Aug 19th vs 20th) ---- Billy history doesn't match

Ninja buyer: http://backpack.tf/profiles/76561198091828564?time=1439967600 (Aug 19th vs 20th) ---- history on items removed doesn't match either

Outpost trades: http://www.tf2outpost.com/trade/26748718 Ninja

Apparently, two sales happened there, but i can't find which items were involved. The ninja was traded with a Memory Leak Gentleman's Gatsby for something i can't figure either:

Ninja seller: http://backpack.tf/profiles/76561198091828564?time=1440054000 (Aug 20th vs 21th)

Ninja buyer: http://backpack.tf/profiles/76561198145940774?time=1440054000 (Aug 20th vs 21th)

=======> Not using

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2) Sold for The Ooze El Jefe (96.5 keys)

http://backpack.tf/profiles/76561198107339012?time=1438498800 (Aug 2nd vs 9th)

Outpost trades: http://www.tf2outpost.com/trade/26676241 Ninja

http://www.tf2outpost.com/trade/26028934 Jefe

=======> 96.5*0.9= ~87 keys

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3) Sold for Vivid Plasma Ye Olde Baker Boy (32 keys) + duped Burning Flames Frenchman's Beret (?) + PKS Big Kill (?) + ~1.8 keys in sweets.

http://backpack.tf/profiles/76561198107339012?time=1438498800 (July 30th vs Aug 2nd)

No outpost trades.

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Mini on the Beret: Sold for Circling Heart Détective Noir (36 keys) + Smoking Flipped Trilby (?) + ~6 keys in sweets.

http://backpack.tf/profiles/76561198002823650?time=1436857200 (July 13th vs 14th)

Outpost trade: http://www.tf2outpost.com/trade/26392248

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Micro on the Trilby: Sold with 2 keys for an Orbiting Fire Thirst Blood (17.5 keys)

http://backpack.tf/profiles/76561198144183186?time=1439017200 (Aug 8th vs 9th)

Outpost trade: http://www.tf2outpost.com/trade/26307364 was closed at the time of the sale, but high chance the Trilby was offered given keys added.

=======> 17.5-2= ~16 keys

Back to the mini: =======> (36+6)*0.9 + 16 = ~54 keys

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Mini on the Big Kill: Sales around ~$23 =======> 23/2.42= 8-10 keys (with taxes) =======> Taking mid range: 9 keys

http://steamcommunity.com/market/listings/440/Professional%20Killstreak%20Big%20Kill

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Main sale =======> (32+9+1.8)*0.9 + 54 = ~93 keys

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Couldn't find more sales.

Summary

- Sales at 87, 93. =======> Taking 87-93 keys range.

Criticism appreciated!