Let's try this again, using the Frostbite KE sale.

http://backpack.tf/item/3756888647

Sale 1) Sold for a Sunbeams Deep Cover Operator + Sunbeams Villain's Veil

http://backpack.tf/profiles/76561198067950675#!/compare/1462406400/1462492800

925 Keys

Mini on Both

http://backpack.tf/profiles/76561198060488196#!/compare/1461542400/1461628800 - Sold for a PE Crone's (925 Keys)

Crone's Micro

http://backpack.tf/profiles/76561198095752814#!/compare/1466553600/1466640000 - ~1000 Keys in Unusuals

http://backpack.tf/profiles/76561197961172123#!/compare/1464652800/1464739200 - Duped Beams TC (~500 - 600) + ~147 Keys + ~17 in Items

http://backpack.tf/profiles/76561197995194055#!/compare/1466640000/1466726400 - ~850 Keys in Unusuals

http://backpack.tf/profiles/76561198063640894#!/compare/1466553600/1466726400 - Duped Beams Cotton + Pro KS Aussie Medigun (~43) = ~1000

Excluding the TC sale as a low Outlier. Using the Cotton sale as Supporting proof. Taking 850 - 1000 Keys for the Crone's.

Macro on the 4 Duped Hats in the First Crone's Sale

http://backpack.tf/profiles/76561198135966781#!/compare/1466380800/1466467200 - Sold + Pro KS Aussie Sniper (38) for a Darkblaze TC (550)

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Sale 2) Sold for a Frostbite Killer Exclusive (690 Keys) + Duped It's a Secret to Everybody Brown Bomber (277.5)

http://backpack.tf/profiles/76561198030595729#!/compare/1469059200/1469232000

690 + 277.5 = 967.5, which I'll round to 970 Keys

Brown Bomber Mini

http://backpack.tf/profiles/76561198030595729#!/compare/1468454400/1468627200 ~304

http://backpack.tf/profiles/76561198017584970#!/compare/1463875200/1463961600 ~250

http://backpack.tf/profiles/76561198120347528#!/compare/1467849600/1468108800 ~270

http://backpack.tf/profiles/76561198063391052#!/compare/1467244800/1467504000 ~300

Credits to Polar for this Mini