Pumpkin Jack

https://backpack.tf/item/1209059277

Sale 1) Sold for a Spectral Swirl Shred Alert (26 Keys)

https://backpack.tf/profiles/76561198086751156#!/compare/1506988800/1507420800

Low Outlier.

Sale 2) Sold for a Cloud 9 Tartan Spartan (15 Keys) + 14 Keys + ~1 Key of Items

https://backpack.tf/profiles/76561198175080646#!/compare/1510012800/1510790400

15 + 14 + 1= 30 Keys

Spartan Mini

https://backpack.tf/suggestion/5a2c8ceacf6c7534ac2e322e - 15 Keys

Sale 3) Sold for a Haunted Ghosts Killer's Kabuto (44.5 Keys)

https://backpack.tf/profiles/76561198087172601#!/compare/1512432000/1512518400

High Outlier.

Sale 4) Sold for a Green Energy Airdog (33.5 Keys) + ~6 Keys of Items

https://backpack.tf/profiles/76561198067948618#!/compare/1512432000/1512518400

33.5 + 6 = 39.5, which rounds to 40 Keys

Airdog Mini

https://backpack.tf/suggestion/5a2cab67cf6c7509f3599ceb - 33.5 Keys