Sale 1:

https://backpack.tf/profiles/76561198063869295#!/compare/1513814400/1513987200 Seller

https://backpack.tf/profiles/76561198260747931#!/compare/1513900800/1513987200 Buyer

Sold for Logo Pyromancer's Mask + Aces TC(40.5) + Blizzardy Norsemann

Norsemann Mini:

https://backpack.tf/profiles/76561198069388365#!/compare/1516406400/1516492800 Seller

https://backpack.tf/profiles/76561198232041512#!/compare/1516406400/1516492800 Buyer

Sold for Smoking Patriot Peak(45.5)

https://backpack.tf/profiles/76561198182681385#!/compare/1513209600/1513296000 Seller

https://backpack.tf/profiles/76561198173257210#!/compare/1513209600/1513296000 Buyer

Sold for 35 pure

Averaging at 40 keys.

Logo Mask Mini:

https://backpack.tf/profiles/76561198084976847#!/compare/1515888000/1515974400

Sold with 5 keys for Searing Plasma Pyromancer's Mask(70)

Only usable, non-discrepant sale to use.

Pricing at 70 as above sale seems like a 1:1.

Total is 70 + 40.5 + 40 = 150.5 keys, rounding down to 150.

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Sale 2:

https://backpack.tf/profiles/76561198260747931#!/compare/1514678400/1514764800

Roboactive Pile of Scrap + Scorching Engy Cap(64) + key + WW Cool Manana Flame Thrower for Anti Freeze War Pig(250)

Flame Thrower Mini:

https://backpack.tf/profiles/76561198238206588#!/compare/1516924800/1517011200

Flame Thrower sold for Stormy Bombing Run(11.5) + 4 keys in sweets (not counting KS, paints etc.)

Total is 15.5, rounding up to 16 to account for paints and stuff (Seller sold items for 3 keys already, still has another 2-3 in items form this trade)

War Pig Mini:

https://backpack.tf/profiles/76561198203537236#!/compare/1514419200/1514592000 Seller

https://backpack.tf/profiles/76561198008994962#!/compare/1514505600/1514678400 Buyer

Sold with 11 keys for Peace Sign HWNM(42) + Hell Fire Stahlhelm(65) + CH Tossle Cap(150)

total is 257 -11 = 246 keys

Only usuable sale that (to me) doesn't look extremely suspicious.

total is 250 - (64 + 16 + 1) = 169 keys, rounding to 170 keys.

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Sale 3:

https://backpack.tf/profiles/76561198119428262#!/compare/1516406400/1516492800 Seller

https://backpack.tf/profiles/76561197984293083#!/compare/1516406400/1516492800 Buyer

Sold for Morning Glory Cotton Head(195)

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Sale 4 :

https://backpack.tf/profiles/76561198219980724#!/compare/1513296000/1513382400 Seller

https://backpack.tf/profiles/76561198063869295#!/compare/1513296000/1513814400 Buyer

Sold for DBD BoA + 8 keys

Brotherhood Mini:

https://backpack.tf/profiles/76561198219980724#!/compare/1513900800/1513987200 Seller

https://backpack.tf/profiles/76561198150447896#!/compare/1513900800/1513987200 Buyer

Sold with 5 keys for Miami Night BoA(80) + Strange DBD Ground Control(37) + Lantern Marauder(52) + Peace Sign Pillar(29.5)

Total is (80+ 37 + 52 + 29.5) - 5 = 193.5, rounding to 195.

only sale that does not large discrepancies.

https://backpack.tf/profiles/76561198082699361#!/compare/1516838400/1516924800

Sold for 149 keys pure. (Miami BoA was bought with 74 keys)

rounding to 150 keys.

Keeping value at 150, as first sale for mini is clearly overpay for a collector of sorts.

150 + 8 = 158 total.

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Sale 5:

https://backpack.tf/profiles/76561198066212843#!/compare/1515456000/1515542400

Sold for Strange Blizzardy Chieftain + Planets Ball-cap + Presidents Hat of Cards + Cloudy Noble

Chieftain Mini:

https://backpack.tf/profiles/76561198139685821#!/compare/1515974400/1516320000

Sold for Planets Marauder(14.5)

https://backpack.tf/profiles/76561198139685821#!/compare/1516838400/1517011200

Sold with Bunnyhopper(2.43) and 11 keys pure for Catastrophic Companions(21.78)

https://backpack.tf/profiles/76561198283288464#!/compare/1516579200/1516665600

Sold for 14 pure (Seller Sold the Big Country for pure, used keys to buy Chieftain)

Valuing at 14.

Ball-cap Mini:

https://backpack.tf/profiles/76561198134801106#!/compare/1516665600/1517011200

Sold for Spec KS Aussie Minigun(17.65)

https://backpack.tf/profiles/76561198118214399#!/compare/1514678400/1517097600

Sold for duped TW Greased Lighting(22)

Hat of Cards Mini:

https://backpack.tf/profiles/76561198066212843#!/compare/1516320000/1516406400

Sold for GF Lucky Shot(21) + 5 keys (Buyer sold OF Slouch to buy it)

Only usable sale.

Cannot find any usable sales for Noble for a Mini.

Total is 14 + 20 + 115 + 26 = 175 keys

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Sale 6 :

https://backpack.tf/profiles/76561198080539814#!/compare/1515456000/1515542400 Seller

https://backpack.tf/profiles/76561198066195760#!/compare/1515456000/1515542400 Buyer

Sold for Strange GE Ground Control(175) + 4 keys

Ground Control Mini:

https://backpack.tf/profiles/76561198208062409#!/compare/1515974400/1516060800

Sold for 15 keys + Aussie Scattergun(23.58) + Spec KS Aussie Sniper Rifle(22.51) + Stormy Coldsnap Cap(48) + Pro KS Collector's Jag(12.14) + Max Head(19.68) + Smoking Pompadour + Knife Storm Whoopee Cap(89.5)

Pompadour has no way to tell price, unsold for months before.

https://backpack.tf/profiles/76561198292137994#!/compare/1513555200/1513641600

Steaming(16) sold with DP Front Runner(18) for Strange Ghosts Private Eye(34.5)

I'll guesstimate the price to be around 16 keys.

15 + 23.58 + 22.51 + 48 + 12.14 + 19.68 + 16 + 89.5 = 246.41, rounding to 250 keys.

https://backpack.tf/profiles/76561198156255538#!/compare/1516924800/1517011200

Ground Control(175) + DBD Wraith Wrap(38.5) + Aussie Scattergun(23.58) + Blizzardy Snaggletooth(12) + Holy Grail Oblooterated(28) for Harvest Dapper Topper (170)

170 - (38.5 + 23.58 + 12 + 28 +) = 102.08, rounding to 100.

Two way different prices, average out to 175 keys.

175 + 4 = 179 keys

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prices are:

150

158

170

175

179

195

195 looks like an outlier.

setting new range from 150 to 180 keys.