Resuggestion, thanks to K1NG for the info!

Sale 1:

https://backpack.tf/profiles/76561198036511368#!/compare/1532390400/1532476800

https://backpack.tf/profiles/76561198068585202#!/compare/1532390400/1532476800

Sold for Beams Translator

http://www.tf2outpost.com/trade/29645115

B/O of 180 keys

use there.

Sale 2:

https://backpack.tf/profiles/76561198068585202#!/compare/1533513600/1533686400

https://backpack.tf/profiles/76561198803829026#!/compare/1533513600/1533600000

Sold for Beams Ballcap(167.5)

Sale 3:

https://backpack.tf/profiles/76561198803829026#!/compare/1534291200/1534377600

https://backpack.tf/profiles/76561198089209637#!/compare/1534291200/1534377600

Sold with 21 keys for Scorching Deep Cover(220)

Total is 199 keys

Sale 4:

https://marketplace.tf/items/644;5;u14

Sold for 300 USD

Keys at 1.97 USD

Total is 152.28 keys

Total sales @:

152, 167.5, 199 keys

https://i.imgur.com/qFl3D7J.jpg

Seller for 185 keys

Calling 199 the outlier,

K1NG's Part:

Marketplace sale was for a dupe:

https://backpack.tf/item/950787285

170 flat should be ok.