Thanks to Payback for helping me.

8 recent sales that I can find

Marketplace.tf sales 1-4: https://marketplace.tf/items/tf2/1118;5;u3048

(10/19/2020) 43.5/1.87=23.26 keys

(11/08/2020) 38/1.81=20.99 keys

(11/14/2020) 38/1.78=21.35 keys

(11/17/2020) 24.44/1.75=13.97 keys

Sale 5:

https://backpack.tf/profiles/76561198092040160#!/compare/1603324800/1604016000

https://backpack.tf/profiles/76561198219288407#!/compare/1603929600/1604361600

Sold for 15 keys

Sale 6:

https://backpack.tf/profiles/76561198050493804#!/compare/1604534400/1605052800

https://backpack.tf/profiles/76561198219288407#!/compare/1604534400/1604707200

Sold for 20 keys

Sale 7:

https://backpack.tf/profiles/76561198281630040#!/compare/1605398400/1605484800

https://backpack.tf/profiles/76561198099260958#!/compare/1605398400/1605484800

Untraceable

Sale 8:

https://backpack.tf/profiles/76561198099260958#!/compare/1605139200/1605398400

https://backpack.tf/profiles/76561198090409013#!/compare/1604707200/1605484800

Untraceable

2 of the sales are untraceable and 2 sales at around 14 and 15 keys seem like outliers since buy orders are at 14 keys. I’m disregarding the outliers so the lowest recent sale would be 20 keys and the higher range rounds to about 23 keys.