Jojo

https://backpack.tf/item/6752117363

Sale 1) Bulk sale for a Secret Tavish's Crown + Anti-Freeze Jumper's Jeepcap + Duped Time Warp Sergeant's Drill Hat

https://backpack.tf/profiles/76561198312555310#!/compare/1555632000/1555718400

https://backpack.tf/profiles/76561198134266699#!/compare/1555632000/1555718400

Sale 2) Sold for 83 Keys

https://backpack.tf/profiles/76561198134266699#!/compare/1555804800/1556064000

https://backpack.tf/item/6768928760

Sale 3) Bulk sale for a Collector's Pro KS Double-Spelled Degreaser

https://backpack.tf/profiles/76561198256704614#!/compare/1556496000/1556755200

https://backpack.tf/profiles/76561198203177648#!/compare/1556668800/1556755200

https://backpack.tf/item/7584611715

Sale 4) Sold for 62 Keys

https://backpack.tf/profiles/76561198097861115#!/compare/1561161600/1561334400

Sale 5) Sold for 68 Keys

https://backpack.tf/profiles/76561198002757046#!/compare/1562716800/1562803200

https://backpack.tf/item/7791739304

Sale 6) Sold for 62 Keys + 1.88 Refined

https://backpack.tf/profiles/76561198146540370#!/compare/1559174400/1559779200

Rounds to 62 Keys

Sale 7) ?

https://backpack.tf/profiles/76561198305676157#!/compare/1561420800/1561507200

https://backpack.tf/profiles/76561198305494036#!/compare/1561420800/1561507200

Sale 8) Sold for 62 Keys

https://backpack.tf/profiles/76561198305494036#!/compare/1561766400/1561852800

https://marketplace.tf/items/tf2/30981;5;u10 - Sold for $100 when Keys were ~$1.83 each (low outlier)

Since 83 happened way back in late April, I'll count it as a high outlier.