Due for an update.

https://backpack.tf/item/3904188724

Sale 1) Sold for 155 Keys + Strange Unique Scattergun (55 Keys)

https://backpack.tf/profiles/76561198146579306#!/compare/1559088000/1559174400

155 + 55 = 210 Keys

Strange Unique Scattergun Mini

https://marketplace.tf/items/tf2/200;6;strange - Sold for $99.99 when Keys were ~$1.83 each

https://marketplace.tf/items/tf2/5021;6

99.99 / 1.83 = 54.64, which rounds to 55 Keys

Sale 2) Sold for 240 Keys

https://backpack.tf/profiles/76561198146579306#!/compare/1559606400/1559692800

https://backpack.tf/item/3902989666

Sale 3) Sold for a Sunbeams Frickin' Sweet Ninja Hood + 25 Keys + Spec KS CAPPER (~2 Keys) + Southie Shinobi

https://backpack.tf/profiles/76561198048475113#!/compare/1562284800/1562371200

There's no Mini for the Ninja, so this can be used to update that.

https://backpack.tf/item/3903439036

Sale 4) Bulk sale for a Strange Normal Sniper Rifle

https://backpack.tf/profiles/76561198289101527#!/compare/1564185600/1564272000

https://marketplace.tf/items/tf2/200;0;strange;kt-3 - Slightly outdated sale for $400

https://marketplace.tf/items/tf2/200;0;strange - Sold for $400 when Keys were ~$1.81 each

https://marketplace.tf/items/tf2/5021;6

400 / 1.81 = 220.99, which rounds to 221 Keys