https://backpack.tf/item/8176258276

(Credits Offline and Shuffle Spy)

https://backpack.tf/profiles/76561198033370726#!/compare/1635292800/1635552000

https://backpack.tf/profiles/76561198049666056#!/compare/1636675200/1636761600

Untraceable

https://marketplace.tf/items/tf2/31049;5;u122

https://backpack.tf/item/8176258276

$110 / $1.81 = 60.77 keys

This got dumped to a bot for 31 Keys then quicksold for 35 Keys

https://gladiator.tf/sales?item=Fifth%20Dimension%20Brain%20Interface&at=2022-02-05T08:54:23.438Z

It's probably best to leave this outdated for now given buyers are miraculously up to 45 Keys.

(Buyers now down to ~37-38 https://gladiator.tf/listings/622fbaa9cf6b5cfe9741396d)

https://backpack.tf/profiles/76561198042975249#!/compare/1644969600/1645056000

https://backpack.tf/profiles/76561199085116273#!/compare/1644969600/1645056000

Was dumped together with Isotope Smissmas Spycrabs War Paint (Field-Tested) to QS.store

https://backpack.tf/profiles/76561199085116273#!/compare/1645747200/1645833600

https://backpack.tf/profiles/76561198091502579#!/compare/1645660800/1645833600

https://gladiator.tf/listings/621a7f611c644ac3577cc9c7

Most likely 46 keys

https://marketplace.tf/items/tf2/31049;5;u122

https://manic.tf/keyprice/?at=2022-03-12&price=119.99

$119.99 / $1.74 = 68.96 keys

https://backpack.tf/item/8157081939

https://backpack.tf/profiles/76561198015947880#!/compare/1643932800/1644019200

https://backpack.tf/profiles/76561198067650695#!/compare/1643673600/1644019200

40 keys

There's a new seller for 60, but it's young: https://gladiator.tf/listings/622fbaa9cf6b5cfe9741396d

Sales:

31, 35, 40, 46, 61 (dumped), 69

Given the marketplace sale at 61 was dumped before for a lot less, this implies that 69 may also be high. Raising conservatively to 40-46.