Sale #1 :

https://backpack.tf/profiles/76561198230818048#!/compare/1499558400/1501286400

Bliz. Storm Private eye (17) + Miami Nights (25.5) + Powdered Practitioner(x) FOR Neutron Star Vive (67) = 67-17-25.5 = 24.5

x = 24.5

Sale #2:

https://backpack.tf/profiles/76561198035640089#!/compare/1501200000/1501372800

Powdered Practitioner(x) + 7keys FOR Green Energy Buckaroo = 29 - 7 = 22

x = 22

Sale #3:

https://backpack.tf/profiles/76561198035640089#!/compare/1502236800/1502496000

untraceable

Sale #4:

https://backpack.tf/profiles/76561198061235880#!/compare/1502496000/1502582400

Powdered Practitioner FOR Bubbling Noble (16)* + Bliz. Storm Bonnet(13.5) + 1 key =  30.5

x = 30.5

Sale #5:

https://scrap.tf/auctions/GL4PTI

Quick-bought for 17 keys

17

B/o was 24

 http://www.tf2outpost.com/trade/29327736

Sale #6:

https://backpack.tf/profiles/76561198218603824#!/compare/1502323200/1503187200

sold for Orbiting Fire Woodsman(31.5)

31.5

Sales at:  (17), 22, 24.5, 30.5, 31.5

MINI:

Bubbling Noble Amassment of Hats

https://backpack.tf/profiles/76561198337244899#!/compare/1502409600/1502668800

Bubbling Noble(x) FOR Circling TF Baron(14.5)* + Bruisers Bandana (22 ref) = 14.5 + 0.76 = 15.76 ~= 16

x = 16

Circling TF Logo Baron von Havenaplane

https://backpack.tf/profiles/76561198232041512#!/compare/1502668800/1502928000

KaW Brain-Warming Wear(13) + 1.5 keys sweets = 14.5