Sale 1:

Sold for 34 keys

http://www.tf2outpost.com/trade/27830623 - B/O of 35

Seller: http://backpack.tf/profiles/76561197999219054/#!/compare/1456732800/1457769600

Buyer: http://backpack.tf/profiles/76561198077338856/#!/compare/1456732800/1457164800

X = 34

Sale 2:

Sold with Strange Pro. KS Natascha for Bubbling KE

http://www.tf2outpost.com/trade/27895381 - B/O of 36

Seller: http://backpack.tf/profiles/76561198138584731/#!/compare/1456560000/1456732800

Buyer: http://backpack.tf/profiles/76561198041115406/#!/compare/1456560000/1456992000

X + 3 = 36

X = 33

Sale 3:

Sold for Duped Green Confetti Modest Pile of Hat

http://www.tf2outpost.com/trade/27915287 - No B/O

Seller: http://backpack.tf/profiles/76561198041115406/#!/compare/1457938800/1458950400

Buyer: http://backpack.tf/profiles/76561198001759277/#!/compare/1458950400/1459036800

Only found one valid sale on the Modest (for a DBD Firewall Helm), which would make this sale an outlier.

Sale 4:

Sold with 7 keys for Purple Confetti Towering Pillar of Hats

Seller: http://backpack.tf/profiles/76561198092497296/#!/compare/1458025200/1458457200

Buyer: http://backpack.tf/profiles/76561198063800214/#!/compare/1458198000/1458457200

Should be used to update the Pillar of Hats

Sale 5:

Bulk for Knifestorm Liquidator’s Lid

Seller: http://backpack.tf/profiles/76561198030050182/#!/compare/1453104000/1453190400

Buyer: http://backpack.tf/profiles/76561198092497296/#!/compare/1453104000/1453881600

Sales at:

33

34 (pure)

Going with 33-34