Resuggestion, thanks to Mindacos for the info!

Sale 1:

https://backpack.tf/profiles/76561198179707937#!/compare/1527724800/1527811200

https://backpack.tf/profiles/76561198030343929#!/compare/1527724800/1527811200

Sold for 19 keys + 5 ref

Sale 2:

https://backpack.tf/profiles/76561198030343929#!/compare/1527897600/1527984000

https://backpack.tf/profiles/76561198001041305#!/compare/1527811200/1527984000

Sold for Spec KS Aussie Sniper + Strange Festivized Specialized Killstreak Shell Shocker Rocket Launcher FT

Total is ~29 keys (Taking sniper at Sell orders)

http://www.tf2outpost.com/trade/29671845

B/O of 28, capping

Sale 3:

https://backpack.tf/profiles/76561198169955173#!/compare/1528070400/1528156800

https://backpack.tf/profiles/76561198335312121#!/compare/1527897600/1528070400

Money involved? More likely a Shark.

Sale 4:

https://backpack.tf/profiles/76561198335312121#!/compare/1528156800/1528243200

Sold for 23 keys.

Mindacos' Part:

More sales:

Sold for 20 Keys

https://backpack.tf/profiles/76561198048851745#!/compare/1530230400/1530316800

Added 4 Keys for an Isotope Turbine Torcher Flame Thrower

https://backpack.tf/profiles/76561198002757046#!/compare/1530316800/1530403200

Best used for that, would support 20 though given the seller: https://cdn.discordapp.com/attachments/301728416657571841/474789775107293210/unknown.png

Looks like 28 is going to be the outlier here. 19-23 should work for this.