Imagine playing Engineer. Just go Soldier like everyone else.

Item 1, and the only item: https://backpack.tf/item/1111264556

Sale 1:

Untraceable.

Sale 2:

Marketplace sale on November 2nd. Confirmed to be in this history.

https://marketplace.tf/items/tf2/48;5;u30

Sold for 169.99 (nice)

Average key price was 1.82

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

169.99 / 1.82 = 91.25

Rounding down to 91.

Buyout was 85 keys, mp sale caps at that.

https://bot.tf/stats/listings/4J56JP0X

https://gyazo.com/18bd1bf0b264bfbc263a8c138c7a86fa

Sale 3:

Used in bulk for the Strange Arcana Commando Elite

https://backpack.tf/profiles/76561198328282971#!/compare/1602374400/1602460800

Excluded.

Sale 4:

Being Used for Gravelly Ghoul Misfortune Fedora.

Mining Light + 6 keys in refined (rounded up from 5.87), 23 keys in pure and the Strange Fragmented Photons Telefraggers Torque. Indate at 52 keys.

https://backpack.tf/profiles/76561198096022249#!/compare/1602201600/1602374400

Going with 85.