https://steamcommunity.com/market/listings/440/Strange%20Blackout%20War%20Paint%20%28Factory%20New%29

Aug 22, 18.20 keys

Aug 23, 18.63 keys (x2)

Aug 23, 31.09 keys

Aug 28, 19.93 keys

Aug 29, 31.85 keys

Sep 2, 20.48 keys

Sep 4, 20.61 keys

Sep 5, 20.72 keys

Sep 10, 24.87 keys

Sep 10, 24.87 keys

Sep 12, 32.99 keys

Sep 15, 21.80 keys

Sep 15, 25.55 keys

https://marketplace.tf/items/tf2/17431;11;w1;pk431

Aug 23, $53.99/1.84 = 29.34 keys (x2)

Aug 24, $54.99/1.84 = 29.88 keys (x2)

Sep 14, $55.99/1.82 = 30.76 keys

Both ends of range seem well supported by sales here.