Party Hearty, Marty, while eating Havarti

https://backpack.tf/item/5026710794

Sale 1) Sold + Steaming Harmburg + ~4 Keys of Items for an Aces High Virtual Viewfinder (80 Keys)

https://backpack.tf/profiles/76561198091164368#!/compare/1500854400/1501027200

Calling this sale low.

Sale 2) Sold for an Orbiting Fire Killer Exclusive + Disco Beat Down Respectless Rubber Glove + ~4 Keys of Items

https://backpack.tf/profiles/76561198159280527#!/compare/1501027200/1501286400

http://www.tf2outpost.com/trade/29295750 - Capped by the Buyout of 69 Keys

Sale 3) Sold + ~1.5 Keys of Items for a Duped Overclocked Killer Exclusive

https://backpack.tf/profiles/76561198190084707#!/compare/1501200000/1501286400

Low Outlier.

KE Mini

https://backpack.tf/profiles/76561198083559832#!/compare/1501286400/1501459200 - Sold for a '72 Schadenfreude (50 Keys)

Sale 4) Sold for a Roboactive Swagman's Swatter (64.5 Keys) + Aces High Magnificent Mongolian + 3 Keys

https://backpack.tf/profiles/76561198071647163#!/compare/1501459200/1501804800

Fits in the range.

Swatter Mini

https://backpack.tf/profiles/76561198070318593#!/compare/1500076800/1500163200 - Sold for a Pro KS Aussie Rocket (~47 Keys) + 25 Keys

https://backpack.tf/profiles/76561198088089886#!/compare/1501632000/1501718400 - Sold + 3 Keys for a Sulphurous Tosslecap (60 Keys)

Tosslecap Micro

https://backpack.tf/suggestion/59ca2bd3cf6c7537b379ef92 - 60 Keys

Sale 5) Sold for a Sunbeams Flipped Trilby (79.5 Keys)

https://backpack.tf/profiles/76561198088089886#!/compare/1502841600/1502928000

Rounds to 80 Keys

Sale 6) Sold for ~78 Keys of Australiums + ~3 Keys of Items

https://backpack.tf/profiles/76561198285658482#!/compare/1504224000/1504310400

78 + 3 = 81, which I'll round to 80 Keys

Sale 7) Sold for an Aces High Polar Pullover

https://backpack.tf/profiles/76561198090520837#!/compare/1505433600/1505520000

http://www.tf2outpost.com/trade/29363991 - Capped by the Buyout of 75 Keys

https://backpack.tf/item/3117622059

Sale 8) Sold + ~1 Key of Items for a Scorching Flames Pampered Pyro (78 Keys)

https://backpack.tf/profiles/76561198103038390#!/compare/1503878400/1503964800

78 - 1 = 77 Keys

Sale 9) Sold + Collector's Frontier Justice (4 Keys) for a Sunbeams Honcho's Headgear

https://backpack.tf/profiles/76561198067575136#!/compare/1505952000/1506124800

http://www.tf2outpost.com/trade/29364585 - Capped by the Buyout of 75 Keys

Using the 2 lower sales to support 69 being in the range.