Re-suggestion, thanks to Mindacos for the info!

Sale 1:

https://backpack.tf/profiles/76561198121096016#!/compare/1529280000/1529625600

https://backpack.tf/profiles/76561198063640894#!/compare/1529539200/1529625600

Sold for Infernal Fubar

Fubar Mini:

https://backpack.tf/suggestion/5b5399a0cf6c75037d679570

Suggestion for 13 keys.

Sale 2:

https://backpack.tf/profiles/76561198063640894#!/compare/1530057600/1530316800

https://backpack.tf/profiles/76561198181288034#!/compare/1530144000/1530230400

Sold for CH Bone Dome

Dome Mini:

https://backpack.tf/suggestion/5b53cfe844325a0e9c354a2e

Suggestion for 36.5 keys

Sale 3:

https://backpack.tf/profiles/76561198181288034#!/compare/1530230400/1530403200

https://backpack.tf/profiles/76561198129205357#!/compare/1530316800/1530403200

Sold for Hot Aqua Marine FT Rocket Launcher(47.5)

Sale 4:

https://backpack.tf/profiles/76561198129205357#!/compare/1531872000/1531958400

https://backpack.tf/profiles/76561198832639251#!/compare/1531872000/1531958400

Bulk.

Sale 5:

https://backpack.tf/profiles/76561198219980724#!/compare/1527724800/1527811200

https://backpack.tf/profiles/76561198181288034#!/compare/1527811200/1527897600

Sold for Max Head + 2 keys + negligible sweets

Total is 21 keys.

Sale 6:

https://backpack.tf/profiles/76561198181288034#!/compare/1527811200/1527897600

https://backpack.tf/profiles/76561198002757046#!/compare/1527724800/1527811200

QS.

Total sales @:

13, 21, 36.5, 47.5

https://i.imgur.com/DDX5vUX.jpg

Unsold for a month at 27.

Mindacos' Part:

the seller at 27 just sold today:

Sold for an Aces High Hong Kong Cone and 4 Keys

https://backpack.tf/profiles/76561198002757046#!/compare/1533168000/1533254400

Buyers at 29 on the HKC, so it looks like this'll easily cap.

21-27 should be fine here.