I have information about 2 of those hats.

Both are being keeping in backpacks, none on market.

One was sold in previous year, other has 2 recent sales.

Sale #1:

http://backpack.tf/profiles/76561198116825177#!/compare/1468540800/1469664000

http://backpack.tf/profiles/76561198159542421#!/compare/1469059200/1469145600

Sold for Blizzardy Storm Hat With No Name + Sunbeams Hotrod.

X = 41 + 51 = 92; BO was 60

---------------------------------------------

Sale #2:

http://backpack.tf/profiles/76561198159542421#!/compare/1467936000/1468022400

Sold with Strange Australium Sniper Rifle and Strange Construction PDA for Circling TF Logo Professional's Ushanka.

X + 39 = 70; X = 31; outlier

---------------------------------------------

Summary: 60 keys.