I think I got it now. Thanks to j58 for their advice on this.

Sale #1:

https://backpack.tf/profiles/76561198036558300#!/compare/1549584000/1549843200

Sold for 22 pure.

Sale #2 (Duped, but under 30 keys, including anyways):

https://backpack.tf/profiles/76561198159656266#!/compare/1554508800/1554595200

Sold for Terror-Watt Powdered Practitioner (15-17 keys) and a Specialized Killstreak Strange Conniver's Kunai (2.12 keys, rounding down to 2)

Taking average for Practitioner, 16 keys.

16 + 2 = 18 keys

In conclusion, 18-22 keys.

Sorry for all the open and close, this is my first time doing price suggestions.