Thief in the Night

https://backpack.tf/item/6630709573

Sale 1) ?

https://backpack.tf/profiles/76561197977483203#!/compare/1528848000/1540857600

Sale 2) Sold for a Clairvoyance Vampire Vanquisher

https://backpack.tf/profiles/76561197963266917#!/compare/1540857600/1540944000

This should price that.

Sale 3) Sold to a quickbuyer for 24 Keys

https://backpack.tf/profiles/76561198185249461#!/compare/1540857600/1540944000

Sale 4) Sold for 26 Keys

https://backpack.tf/profiles/76561198337734785#!/compare/1540857600/1541030400

https://backpack.tf/profiles/76561198253940521#!/compare/1540944000/1541030400

Sale 5) Sold for a Scorching Flames Stately Steel Toe (28 Keys) + 2 Keys + 12.5 Refined of Items

https://backpack.tf/profiles/76561198253940521#!/compare/1541376000/1541462400

28 + 2 + 0.3 = 30.3, which rounds to 30 Keys

Toe Mini

https://marketplace.tf/items/481;5;u14 - Sold for $49.99 when Keys were ~$1.78 each

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

49.99 / 1.78 = 28.08, which rounds to 28 Keys

Sale 6) Sold + 3 Keys + ~17 Refined of Items for a Scorching Flames Janissary Ketche (~30 Keys)

https://backpack.tf/profiles/76561198040998121#!/compare/1541721600/1541808000

https://backpack.tf/profiles/76561198070705963#!/compare/1541721600/1541808000

30 - 3 - 0.5 = 26.5, which rounds to 27 Keys

Ketche Mini

https://backpack.tf/profiles/76561198126202356#!/compare/1537488000/1537574400 - Sold for 31 Keys

https://imgur.com/a/1lwgREE - Seller at 29 Keys (13 Hours), 30 Keys (2 Days), 34 Keys (2 Months). Buyer at 27 Keys.

https://backpack.tf/item/299150907

https://backpack.tf/item/921795326

https://backpack.tf/item/470532859

https://backpack.tf/u/76561198073438708

Taking 30 Keys

Sale 7) Sold + 2 Keys for an Australium Eyelander (~28 Keys)

https://backpack.tf/profiles/76561198407541175#!/compare/1542758400/1542844800

28 - 2 = 26 Keys

Sale 8) Bulk sale for a Ghastly Ghosts Jr Full Metal Drill Hat

https://backpack.tf/profiles/76561198325595749#!/compare/1542931200/1543017600