Sale 1:

Sold for Pro. KS Aussie Sniper Rifle (33)

http://www.tf2outpost.com/trade/28455847 - Deleted B/O

Seller: http://backpack.tf/profiles/76561197993383111#!/compare/1475280000/1475366400

Buyer: http://backpack.tf/profiles/76561198102546793#!/compare/1474848000/1475539200

X = 33

Sale 2: (Happened after I submitted the suggestion) - Credit to Fluffy!

Sold for 30 keys + Mannrobics (1.5) + Kazotsky (1.75)

http://www.tf2outpost.com/trade/28562015 - B/O of 35

Seller: http://backpack.tf/profiles/76561198080250669#!/compare/1478217600/1478304000

Buyer: http://backpack.tf/profiles/76561198154875977#!/compare/1478131200/1478304000

https://imgur.com/a/SkPyc

X = 33

Sale 3:

Quicksold for 20 keys

No outpost

Seller: http://backpack.tf/profiles/76561198000091310#!/compare/1474156800/1474243200

Buyer: http://backpack.tf/profiles/76561198073592638#!/compare/1474156800/1474243200

X = 20

Sellers:

http://www.tf2outpost.com/trade/28562015 - 1 week, was in classifieds for longer

^ This is now sale 2

36 keys:

http://i.imgur.com/1nA4ry1.png

http://backpack.tf/u/76561198115175633

Buyer at 27 keys:

http://backpack.tf/profiles/76561198154875977 (most likely buying for keeps, looking at his avatar)

^ Buyer bought the hat from Fluffy

Sales at:

33 (2x)

20

Sale at 20 quicksold, and is countered by the buyer.

Going with 33 flat.