Sales

Sale 1: Sold for 14 keys

https://backpack.tf/profiles/76561198267189538#!/compare/1598313600/1598400000

https://backpack.tf/profiles/76561198158206236#!/compare/1598227200/1598400000

https://bot.tf/stats/listings/YD161R75

Sale 2: Untrace

https://backpack.tf/profiles/76561198096619846#!/compare/1597449600/1597536000

https://backpack.tf/profiles/76561198267189538#!/compare/1597449600/1597536000

Probably marketplace.

Sale 3: Untrace/Bulk

https://backpack.tf/profiles/76561198071261448#!/compare/1593993600/1594252800

https://backpack.tf/profiles/76561197968633696#!/compare/1594252800/1594425600

Marketplace

https://marketplace.tf/items/tf2/30958;5;u123

July

$37 on July 4 (37/2 = 18.5 rounding to 19 keys)

https://manic.tf/keyprice/?at=2020-07-04

20.2 on July 7 (20.2/1.98 = 10~)

https://manic.tf/keyprice/?at=2020-07-07

36.9 on July 19 (36.9/1.97 = 19~)

https://manic.tf/keyprice/?at=2020-07-19

September

$20 on September 4 (20/1.83 = 11~)

https://manic.tf/keyprice/?at=2020-09-04

34.99 on September 21 (34.99/1.84 = 19~)

https://manic.tf/keyprice/?at=2020-09-21

Classifieds

https://gyazo.com/5317ee4b71c53784a6f0e9363ebd8ea1

Current buyer at 11 for a month now.

Summary

Sales at 14.

Marketplace sales at 10, 11, 19, 19, and 19.

Conclusion

Buyer at 11 showing that 10, 11 are both low.

Going with 14-19 here.