Sale 1:

https://backpack.tf/profiles/76561198859529418#!/compare/1558569600/1558915200

https://backpack.tf/profiles/76561198043936328#!/compare/1558483200/1558569600

QS?

Sale 2:

https://backpack.tf/profiles/76561198109986831#!/compare/1559347200/1559433600

https://backpack.tf/profiles/76561198822758602#!/compare/1559347200/1559433600

Sold for at least 14 keys, definitely more, but can't accurately tell how many.

https://bot.tf/stats/listings/YDJN2QVY

B/O points to it being in-range.

Sale 3:

https://backpack.tf/profiles/76561198018634681#!/compare/1557532800/1557619200

https://backpack.tf/profiles/76561198161711912#!/compare/1557446400/1557532800

Bulky

Sale 4:

https://backpack.tf/profiles/76561198161711912#!/compare/1557792000/1557878400

https://backpack.tf/profiles/76561198063374926#!/compare/1557792000/1557878400

Sold for 18 keys + ~1 key in sweets

Total is 19 keys

Sale 5:

https://backpack.tf/profiles/76561198070664114#!/compare/1554336000/1554422400

https://backpack.tf/profiles/76561198073438708#!/compare/1554249600/1554336000

Bulk

Sale 6:

https://backpack.tf/profiles/76561198073438708#!/compare/1556841600/1556928000

https://backpack.tf/profiles/76561198149163459#!/compare/1556928000/1557273600

Sold for 22 keys

Sale 7 - 10:

https://marketplace.tf/items/135;5;u29

$33.00 / $1.77 = 18.64 keys

$41.99 / $1.83 = 22.95 keys

$28.76 / $1.8 = 15.98 keys

$43.99 / $1.84 = 23.91 keys

Total sales @:

15.98, 18.64, 19, 22, 22.95, 23.91 keys

Buyers up to 17 keys,

Unsolds for 24 keys,

Taking 19 - 24 keys