Barry Allen is letting me resuggest for him.

Credits to him for Sale 1.

http://backpack.tf/item/5003416795

Sale 1) Sold for a Duped Haunted Ghosts Milkman (40) + Disco Beat Down Bot Dogger (35)

http://backpack.tf/profiles/76561198212091477#!/compare/1470096000/1470441600

40 + 35 = 75 Keys

Mini for Both

http://imgur.com/a/VC7xy - 35 Keys for the Bot Dogger, 40 Keys for the Milkman (Yes, that one is Duped)

http://backpack.tf/item/277398723 - Milkman

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Sale 2) Sold + Duped Orbiting Planets Strontium Stovepipe for a Darkblaze Honcho's Headgear (101.5 Keys)

http://backpack.tf/profiles/76561198165055074#!/compare/1471737600/1471824000 - Seller's Inventory

Somewhere around 93 Keys, with a Buyer for Strontium on the Classified Ads for 8 Keys.

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Sale 3) Sold + 8 Keys for a Harvest Moon Lucky Shot (87 Keys)

http://backpack.tf/profiles/76561198145402130#!/compare/1471824000/1471910400 - Buyer's Backpack

87 - 8 = 79 Keys

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Sale 4) Sold + Strange Pro KS Low Profile SMG (~12 Keys) + 2 Keys for a Molten Mallard Executioner (90 Keys)

https://gyazo.com/b6b4672de5754f874f44b95cbb7efbf3 - Credits to Kriotus

http://backpack.tf/profiles/76561198180186261#!/compare/1471910400/1471996800 - Credits to Kriotus

90 - 14 = 76 Keys

Executioner Mini

http://www.tf2outpost.com/trade/28441162 - 90 Keys

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Sale 5) Sold for a Purple Hustler's Hallmark (85 Keys) + 3 Keys

http://backpack.tf/profiles/76561198180186261#!/compare/1471910400/1471996800 - Credits to Kriotus, Buyer's Backpack

85 + 3 = 88 Keys

Hallmark Mini

http://imgur.com/a/JiOWF - 85 Keys

http://backpack.tf/item/272096280

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Sale 6) Sold for a Morning Glory Screamin' Eagle (85 Keys)

http://backpack.tf/profiles/76561198139391646#!/compare/1472515200/1472601600

Eagle Mini

http://www.tf2outpost.com/trade/28457921 - 85 Keys. I could use the Classified Buyout of 80 Keys, but it'd still fit into the range either way.

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Sale 7) Sold + Duped Orbiting Planets Birdcage for a Circling TF Logo Patriot Peak (87.5 Keys)

http://backpack.tf/profiles/76561198069334193#!/compare/1472601600/1472688000

I doubt the Birdcage is over 12 Keys, so it'll still fit in the range.

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Sale 8) Sold for a Green Black Hole Company Man + ~1 Key in Items

http://backpack.tf/profiles/76561198197516958#!/compare/1473379200/1473465600

http://www.tf2outpost.com/trade/28458317 - Capped by the Buyout of 100 Keys

Given the variety of sales, I'm making a wide range.