Hot take

https://backpack.tf/item/7233430208

Sale 1) ?

https://backpack.tf/profiles/76561198182301555#!/compare/1546214400/1547164800

Sale 2) Quicksold for 44 Keys

https://backpack.tf/profiles/76561198227756380#!/compare/1546732800/1546819200

Sale 3) Sold for 49 Keys

https://backpack.tf/profiles/76561198002757046#!/compare/1549929600/1550016000

https://backpack.tf/profiles/76561198043831775#!/compare/1549929600/1550016000

R+ubi commented on my profile saying the sale was 49 Keys -> https://imgur.com/a/FHvkYqv

https://backpack.tf/item/6989499642

Sale 4) Sold for 55 Keys + Disco Beat Down Blast Defense

https://backpack.tf/profiles/76561198107260155#!/compare/1544832000/1544918400

https://backpack.tf/profiles/76561198023167820#!/compare/1544745600/1544918400

High outlier.

https://backpack.tf/item/7455801153

Sale 5) ?

https://backpack.tf/profiles/76561198140040524#!/compare/1548633600/1548806400

https://backpack.tf/profiles/76561198161016501#!/compare/1548720000/1548806400

Sale 6) ?

https://backpack.tf/profiles/76561198161016501#!/compare/1548806400/1548892800

https://backpack.tf/profiles/76561198046393528#!/compare/1548720000/1548806400

Sale 7) ?

https://backpack.tf/profiles/76561198046393528#!/compare/1548720000/1548806400

https://backpack.tf/profiles/76561198071260200#!/compare/1548720000/1548806400

Looks like it may have been 41 Keys.

Sale 8) Sold for a Stormy Storm Coldsnap Cap + ~3 Keys of Items

https://backpack.tf/profiles/76561198071260200#!/compare/1548806400/1548892800

Fits in the range.

Sale 9) Bulk sale

https://backpack.tf/profiles/76561198105071091#!/compare/1548892800/1548979200

https://backpack.tf/item/6893375461

Sale 10) Sold for 45 Keys

https://backpack.tf/profiles/76561198804015732#!/compare/1546646400/1546819200

Counting this sale as low since it went to a known quickbuyer.

Sale 11) Sold for 46 Keys

https://backpack.tf/profiles/76561198119634686#!/compare/1546905600/1546992000

Sale 12) Bulk sale

https://backpack.tf/profiles/76561198118034973#!/compare/1547078400/1547164800

Sale 13) Quicksold for 41 Keys

https://backpack.tf/profiles/76561198256438505#!/compare/1546992000/1547164800

Sale 14) Sold for 47 Keys

https://backpack.tf/profiles/76561198119634686#!/compare/1547251200/1547337600

https://backpack.tf/item/6707002858

Sale 15) Sold for 61 Keys

https://backpack.tf/profiles/76561198078375939#!/compare/1545004800/1545091200

https://backpack.tf/profiles/76561198183060018#!/compare/1545091200/1545436800

https://marketplace.tf/items/30863;5;u14v - Sold for $175 (high outlier)