Football time.

https://backpack.tf/item/269403930

Sale 1) Sold for 52 Keys + 1 Refined

https://backpack.tf/profiles/76561198089253101#!/compare/1538092800/1538179200

Rounds to 52 Keys

Sale 2) Sold for 54 Keys

https://backpack.tf/profiles/76561198119634686#!/compare/1539216000/1539302400

https://backpack.tf/profiles/76561198140040374#!/compare/1539302400/1539388800

Sale 3) ?

https://backpack.tf/profiles/76561198140040374#!/compare/1539388800/1539475200

https://backpack.tf/profiles/76561198159152968#!/compare/1539302400/1539388800

https://backpack.tf/item/4964777527

Sale 4) ?

https://backpack.tf/profiles/76561198192602363#!/compare/1541721600/1541808000

https://backpack.tf/profiles/76561198056793444#!/compare/1541721600/1541808000

https://backpack.tf/item/5550270831

Sale 5) ?

https://backpack.tf/profiles/76561198083235528#!/compare/1537142400/1537228800

Sale 6) Sold for 50 Keys

https://backpack.tf/profiles/76561198002757046#!/compare/1542758400/1542844800

https://backpack.tf/item/165527834

Sale 7) ?

https://backpack.tf/profiles/76561198045232326#!/compare/1540944000/1541030400

Sale 8) Sold for 45 Keys

https://backpack.tf/profiles/76561198119634686#!/compare/1543536000/1543622400

Low outlier.

Sale 9) Quicksold for 40 Keys

https://backpack.tf/profiles/76561198101327173#!/compare/1543536000/1543622400

Low outlier.

https://marketplace.tf/items/135;5;u9 - Sold for $70.15 when Keys were ~$1.77 each

https://marketplace.tf/items/5021;6/Mann%20Co.%20Supply%20Crate%20Key

70.15 / 1.77 = 39.63 Keys

Low outlier.

https://imgur.com/a/6npIowr - 3 Day/2 Hour Sellers at 51 Keys, 3 Day Duped/2 Day/1 Month Duped Sellers at 55 Keys