Re-suggesting with a better range.

Sparky.

http://backpack.tf/item/5195745433

Sale 1) Sold for an Orbiting Fire Panama (15 Keys) + DP Burning Bandana (12.5 Keys) + ~12 Keys in Items + 4 Keys

http://backpack.tf/profiles/76561198116262699#!/compare/1478217600/1478304000

15 + 12.5 + 12 + 4 = 43.5, which rounds to 44 Keys

http://backpack.tf/item/5195745433

Sale 2) Sold for a Misty Skull Conquistador (45 Keys)

http://backpack.tf/profiles/76561198059242909#!/compare/1481414400/1481500800

http://backpack.tf/item/5187124827

Sale 3) Sold + Electric Hat Protector Universal Translator (32 Keys) + 1 Key for a Death at Dusk Your Worst Nightmare (90 Keys)

http://backpack.tf/profiles/76561198081967527#!/compare/1479513600/1479600000

90 - (32 + 1) = 57 Keys

Translator Mini

http://imgur.com/a/w9ktw - Using the 32 Key Seller

Nightmare Mini

http://www.tf2outpost.com/trade/28621601 - Unsold at 90 Keys for 3 Weeks