Resuggesting.

Sales

Sale 1: Untrace, bot.tf says 20 keys

https://backpack.tf/profiles/76561198305676157#!/compare/1593820800/1593907200

https://backpack.tf/profiles/76561198119198857#!/compare/1593734400/1593907200

https://bot.tf/stats/item?def=1015&q=5&ef=Ominous%20Night&craft=1&aus=0&ks=0&source=browser_script

https://gyazo.com/32c9a116b6cfd40a5700e011ea75a474

Sale 2: 16 to a buyorder

https://backpack.tf/profiles/76561198339945463#!/compare/1590969600/1591056000

https://backpack.tf/profiles/76561198305676157#!/compare/1590969600/1591056000

Sale 3: 23 keys

https://backpack.tf/profiles/76561198314211872#!/compare/1590278400/1590364800

https://backpack.tf/profiles/76561198339945463#!/compare/1590192000/1590278400

Marketplace

https://marketplace.tf/items/tf2/1015;5;u3022

June

$45 on June 21 (45/1.99 = 23~)

https://manic.tf/keyprice/?at=2020-06-21

Listings during the time: https://bot.tf/stats/listings/Y5ZLQ812

$45 on august 3 (45/1.89 = 24~)

https://manic.tf/keyprice/?at=2020-08-03

Listings during the time: https://bot.tf/stats/listings/4KV7PVX8

Classifieds

https://gyazo.com/63b5e722d535475a0c2706fc619adf38

Summary

Sales are at 16, 20(possibly) 23, 23 and 24.

Conclusion

16 was to a buyorder. 20 is unconfirmed. Excluding both.

Going with 23-24 here.