The Electricutioner

https://backpack.tf/item/5202658228

Sale 1) Sold + 11 Keys + ~2 Keys of Items for an It's a Secret to Everybody Whoopee Cap (94 Keys)

https://backpack.tf/profiles/76561198061489334#!/compare/1497657600/1497744000

94 - 11 - 2 = 81, which I'll round to 80 Keys

https://backpack.tf/item/5206247379

Sale 2) Sold for a Bubbling Antlers (100 Keys)

https://backpack.tf/profiles/76561198084130751#!/compare/1498435200/1498521600

High Outlier.

Sale 3) Sold + Circling Peace Sign Patriot Peak for a Burning Flames Bot Dogger

https://backpack.tf/profiles/76561198039844252#!/compare/1498435200/1498521600

Bulk.

Sale 4) Sold for a Power Surge Towering Pillar of Hats (56 Keys) + ~12.5 Keys of Items + 11 Keys

https://backpack.tf/profiles/76561198128817586#!/compare/1499644800/1499731200

56 + 12.5 + 11 = 79.5, which rounds to 80 Keys

Sale 5) Sold for a Searing Plasma Neckwear Headwear

https://backpack.tf/profiles/76561198256589823#!/compare/1501804800/1501891200 - Buyer's Backpack

Using for the Neckwear.

https://backpack.tf/item/5189320241

Sale 6) Sold for a Duped Purple Energy Vintage Merryweather (42 Keys) + 7 Keys

https://backpack.tf/profiles/76561198303652686#!/compare/1496966400/1497571200

42 + 7 = 49 Keys. Counting this as low because of the 50 pure quicksell and 55 pure selling quickly, but it supports the low end.

Merryweather Mini

https://backpack.tf/profiles/76561198303652686#!/compare/1497657600/1497830400 - Sold for 35 Keys to Nupp (not in the Merryweather History)

https://backpack.tf/profiles/76561198176117759#!/compare/1497657600/1497830400 - Sold for an Overclocked Gibus (45.5 Keys, this went to Nupp)

https://backpack.tf/profiles/76561198176117759#!/compare/1497657600/1497830400 - Sold + ~13 Keys of Items for a Burning Flames Bloke's (51 Keys)

Taking 38 - 46 Keys.

Sale 7) Sold + 5 Keys for a Scorching Flames Little Buddy (58 Keys)

https://backpack.tf/profiles/76561198312277361#!/compare/1497916800/1498003200

58 - 5 = 53, which I'll round to 55 Keys

Sale 8) Quicksold for 50 Keys

https://backpack.tf/profiles/76561198163549413#!/compare/1497830400/1498003200 - Buyer's Backpack

Sale 9) Sold for 55 Keys + <0.5 Keys of Refined

https://backpack.tf/profiles/76561198163549413#!/compare/1498003200/1498089600

Quicksold, but supports the low end since there are also multiple lower sales.

Sale 10) Sold for a Smoking Cold Killer (26 Keys) + C9 Belgian (21 Keys) + Nuts Heer's + Nuts Steel Shako + ~9.5 Keys of Items

https://backpack.tf/profiles/76561198329291302#!/compare/1498176000/1498262400

There are no Minis for the Heer's or Shako, but this sale supports the high end.