https://marketplace.tf/items/tf2/30067;5;u19

$135.88 / $2.10 = 64.70 keys https://backpack.tf/item/7492393624

$149.99 / $2.19 = 68.49 keys https://backpack.tf/item/7791799259

$149.99 / $2.06 = 72.81 keys https://backpack.tf/item/9635557607

https://backpack.tf/profiles/76561198453530349#!/compare/1614038400/1614124800

https://backpack.tf/profiles/76561198286159018#!/compare/1613433600/1614124800

51 keys, buyout was 53 https://gladiator.tf/listings/60360c24cf0f7c1a20bc84e5

From the item history, it looks like it was listed for a month

https://backpack.tf/profiles/76561198286159018#!/compare/1615593600/1616457600

https://backpack.tf/profiles/76561199048815630#!/compare/1616112000/1616198400

Untraceable

https://backpack.tf/profiles/76561199048815630#!/compare/1616198400/1616284800

https://backpack.tf/profiles/76561198091502579#!/compare/1616198400/1616284800

Untraceable, only 15 keys matches

https://backpack.tf/item/7791799259

it's all gambling

https://backpack.tf/profiles/76561198845450598#!/compare/1611273600/1612915200

https://backpack.tf/profiles/76561199111658162#!/compare/1612828800/1612915200

https://gladiator.tf/listings/6024437afe0293ab4136033e

Likely went to a buy order, ~45 keys at the time

https://backpack.tf/profiles/76561199111658162#!/compare/1612915200/1613001600

likely sold same day, presumably under scrapyard's sell listing

Sales:

buy order

same day sell, likely under 53

53

64

68

73

marketplace life

going with 53-73