Night Chills

https://backpack.tf/item/1521303213

Sale 1) Sold for a Smoking Napper's Respite (15.5 Keys) + 12 Keys

https://backpack.tf/profiles/76561198091502579#!/compare/1536710400/1536796800

15.5 + 12 = 27.5, which rounds to 28 Keys

Smoking Napper's Mini

https://backpack.tf/suggestion/5c06f25444325a71d91234b7 - 15.5 Keys

Sale 2) Sold for a Purple Energy Respectless Rubber Glove (25 Keys)

https://backpack.tf/profiles/76561198159855421#!/compare/1540598400/1540684800

Glove Mini

https://backpack.tf/suggestion/5c06f909cf6c755a6a7e8959 - 25 Keys

https://backpack.tf/item/1115399047

Sale 3) Sold for 30 Keys

https://backpack.tf/profiles/76561198088331867#!/compare/1543622400/1543708800

Sale 4) Sold for a Clairvoyance Sky High Fly Guy (21.5 Keys) + 5 Keys + ~1 Key of Items

https://backpack.tf/profiles/76561198085880346#!/compare/1543449600/1543708800

21.5 + 5 + 1 = 27.5, which rounds to 28 Keys

Sky High Mini

https://backpack.tf/suggestion/5bf75eebcf6c75095e3f333c - 21.5 Keys

https://backpack.tf/item/1056075384

Sale 5) Sold for 24 Keys

https://backpack.tf/profiles/76561198080179568#!/compare/1542758400/1542844800