Take 2

Sale 1: 6.5 keys + Orbiting Fire Brigade Helm (20) --> 26.5 keys; rounding to 27 keys

http://backpack.tf/profiles/76561198190077285#!/compare/1493942400/1494028800

Sale 2: 22 keys on marketplace

https://marketplace.tf/items/616;5;u29

Sale 3: Max Head? Or Spec KS Australium Knife? Compare links don't match; so not using

http://backpack.tf/profiles/76561198334066390#!/compare/1494979200/1495065600

http://backpack.tf/profiles/76561198113832763#!/compare/1495065600/1495152000

Sale 4; Slightly over 2 months old: 20 keys pure

http://backpack.tf/profiles/76561198150342795#!/compare/1489795200/1489881600

- - - - -

Comment from K1ng in my previous suggestion with extra sales and range:

"Sold with 11 keys for a Miami Thirst (outdated at 26.5) ----- Should be used for the Thirst

http://backpack.tf/profiles/76561198083510257#!/compare/1496102400/1496275200

http://backpack.tf/profiles/76561198127938353#!/compare/1496188800/1496275200

Sold for a Blizzardy Big Elfin (outdated at 24) ----- Should be used for the Elfin

http://backpack.tf/profiles/76561198083510257#!/compare/1495584000/1495756800

Sold for an Orbiting Fire Private Eye (17)

http://backpack.tf/profiles/76561198067575136#!/compare/1495670400/1495756800

So there are sales at 17, 20 (pure), 22 (marketplace.tf), and matured sellers for 18.5, 19 (previous one), 23. After talking with other mods, we agreed that 17-20 is probably the best option here."

http://backpack.tf/suggestion/591f197fc4404566ea6bbbfc#comment-593c4dfe0e2cad352f3fb082