Under the Mistletoe

https://backpack.tf/item/5032254533

Sale 1) Sold for a Collector's Bat Outta' Hell (50 Keys)

https://backpack.tf/profiles/76561198072999396#!/compare/1507248000/1507334400

Sale 2) Sold for a Tesla Coil Modest Pile of Hat (53.5 Keys) + 6 Keys

https://backpack.tf/profiles/76561198071041124#!/compare/1508976000/1509062400

53.5 + 6 = 59.5, which rounds to 60 Keys

Modest Mini

https://backpack.tf/profiles/76561198161050021#!/compare/1506988800/1507075200 - Sold + Australium Tomislav (11 Keys) + ~2 Keys of Items for a C9 Muffs

I can't find a Mini for the Muffs, so I'll use the Modest's 4 Month price of 53.5 Keys. The price was only 2 Months old when this Kiss sale happened.

https://backpack.tf/item/6380028931

Sale 3) Sold for 44 Keys to a Quickbuyer

https://backpack.tf/profiles/76561198100929724#!/compare/1512604800/1512691200

Low Outlier.

https://imgur.com/a/2ozrC - 1 Day Seller at 58 Keys, 12 Day Seller at 58 Keys, 2 Month Seller at 63 Keys, 4 Month Seller at 80 Keys, 5 Month Seller at 80 Keys