Re-suggestion, thanks to Joxu & Mindacos for the info!

Sale 1:

https://backpack.tf/profiles/76561198202135278#!/compare/1523404800/1523577600

Bulk.

Sale 2:

https://backpack.tf/profiles/76561198202135278#!/compare/1526688000/1526860800

https://backpack.tf/profiles/76561198089434990#!/compare/1526774400/1527120000

Sold for 27 pure (keys came from selling Pro KS Minigun kit to Scrap bot.)

Sale 3:

https://backpack.tf/profiles/76561198051980490#!/compare/1523404800/1523491200

https://backpack.tf/profiles/76561198243076082#!/compare/1523318400/1523491200

Sold with MS Bouncer(8.75) for HG Hedge.

Better used there.

Sale 4:

https://backpack.tf/profiles/76561198243076082#!/compare/1525392000/1525478400

https://backpack.tf/profiles/76561197977853499#!/compare/1525392000/1525478400

Bulk.

Sale 5:

https://backpack.tf/profiles/76561197977853499#!/compare/1526083200/1526169600

https://backpack.tf/profiles/76561198281723502#!/compare/1526083200/1526169600

Sold for 22 keys

Sale 6:

https://backpack.tf/profiles/76561198281723502#!/compare/1526256000/1526342400

https://backpack.tf/profiles/76561198128130998#!/compare/1526256000/1526342400

Sold for 20 keys + 14 ref

Sale 7:

https://backpack.tf/profiles/76561198128130998#!/compare/1526342400/1526428800

https://backpack.tf/profiles/76561198041448348#!/compare/1526256000/1526428800

Untraceable. SCM?

Total sales @:

20.5, 22, 27.

Joxu's part:

New sale:

https://backpack.tf/profiles/76561198089434990#!/compare/1529625600/1529712000

https://backpack.tf/profiles/76561198125791160#!/compare/1529539200/1529625600

Bulk for a duped Blizzardy KE

Mindacos' part:

The Ghosts Hedge has sellers at ~20 currently. Even if that sale is better used there, it's proof that 27 flat for this is too high.

I'd be okay with excluding 20 here and going 22-27, since there's just too much proof of a drop being necessary to go flat here.

Going with 22 - 27 keys.