sale #1 - untrace

https://backpack.tf/profiles/76561198197292179#!/compare/1588118400/1588291200

https://backpack.tf/profiles/76561197963262796#!/compare/1588118400/1588377600

sale #2 - untrace

https://backpack.tf/profiles/76561198125791160#!/compare/1586736000/1586822400

https://backpack.tf/profiles/76561198013596262#!/compare/1586736000/1586995200

sale #3 - 10 keys

https://backpack.tf/profiles/76561198013596262#!/compare/1588809600/1589068800

https://backpack.tf/profiles/76561198040186479#!/compare/1588982400/1589068800

https://gyazo.com/b8924589f9e11bddcb1c1ba828dad769

sale #4 - https://marketplace.tf/items/tf2/185;5;u8 | https://backpack.tf/item/226576296 | no clue on b/o

$22.99 / $1.69 = 13.60 keys

sale #5 - https://marketplace.tf/items/tf2/185;5;u8 | no clue on history or b/o

$22.99 / $1.68 = 13.68 keys

sale #6 - https://marketplace.tf/items/tf2/185;5;u8 | no clue on history or b/o

$23 / $1.89 = 12.17 keys

sale #7 - https://marketplace.tf/items/tf2/185;5;u8 | https://backpack.tf/item/238460859 | my b/o was 13 keys

24.99 / 1.89 = 13.22, rounded and capped @ 13

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Taking 12 - 14 keys

Excluding 10 keys due to the fact the guy listed it for 10 and it sold to me within minutes of listing