Knifeborn.

http://backpack.tf/item/1207638902

Sale 1) Sold for a Pro KS Aussie Mini (36 Keys) + Max's (19 Keys) + SF Spec KS Medi (18 Keys) + Pro KS Aussie Tomislav (17 Keys) + ~10 Keys in Items

http://backpack.tf/profiles/76561198079275897#!/compare/1486771200/1486944000

36 + 19 + 18 + 17 + 10 = 100 Keys

http://backpack.tf/item/1247190706

Sale 2) Sold for a Mega Strike Flippin' Awesome (80 Keys) + ~10 Keys in Items

http://backpack.tf/profiles/76561197961465738#!/compare/1487030400/1487116800 - Buyer's Backpack

80 + 10 = 90 Keys

Flippin' Mini

http://backpack.tf/profiles/76561197988155310#!/compare/1483920000/1484006400 - Mega Strike RPS (~80 Keys)

http://backpack.tf/profiles/76561198156315732#!/compare/1483833600/1484006400 - Nebula Head Full of Hot Air (90 Keys)

http://backpack.tf/profiles/76561198129142112#!/compare/1483833600/1486339200 - Sold + Nebula Toadstool for a DBD Tipped (~70 Keys)

http://backpack.tf/profiles/76561198175249965#!/compare/1484956800/1485043200 - Time Warp Anger (~80 Keys)

http://backpack.tf/profiles/76561198066195760#!/compare/1485388800/1485475200 - Stormy Wraith + Slumber Bootleg + Stormy Gonzilla (~90 Keys)

http://imgur.com/a/axhDq - Sellers and Unsolds from 80 to 95 Keys supports this range.

http://www.tf2outpost.com/trade/28793315 - Seller at 70 Keys