Resuggestion, thanks to Cashew for the info!

Sale 1:

https://backpack.tf/profiles/76561198373747887#!/compare/1583539200/1583625600

https://backpack.tf/profiles/76561198074924284#!/compare/1583539200/1583625600

Bulk

sale 2:

https://backpack.tf/profiles/76561198074924284#!/compare/1585008000/1585440000

https://backpack.tf/profiles/76561198208368068#!/compare/1585440000/1585526400

Sold for 20 keys

sale 3:

https://backpack.tf/profiles/76561198208368068#!/compare/1585526400/1586044800

https://backpack.tf/profiles/76561198080179568#!/compare/1585958400/1586044800

QS

sale 4:

https://backpack.tf/profiles/76561198080179568#!/compare/1587427200/1587513600

https://backpack.tf/profiles/76561198331337374#!/compare/1585785600/1587859200

Keys

sale 5:

https://marketplace.tf/items/tf2/324;5;u16

$35 / $1.68 = 20.83 keys

$20.27 / $1.69 = 11.99 keys

$34.99 / $1.70 = 20.58 keys

Total sales @:

12, 20, 21, 21 keys

Cashew's Part:

https://bot.tf/stats/listings/4EP05RLK

https://backpack.tf/profiles/76561198305494036#!/compare/1588982400/1589068800 new sale at 17. They lowered from 18 a week ago.

https://imgur.com/a/Q67YbRL

Buyer has relisted at 20. With the current marketplace seller at $37 or 19.5 keys (https://backpack.tf/item/496230540), 17 should probably be included.