Another one.

Sold with ~3 Keys in Sweets for a Steaming Pencil Pusher(17.5 Keys, rounding to 18)(15 Keys total)

http://backpack.tf/profiles/76561198123097664#!/compare/1456128000/1456387200

http://backpack.tf/profiles/76561198096082520#!/compare/1456128000/1456387200

Sold for a Blizzardy Storm Big Country(15 Keys) and ~1 Key in Sweets(16 Keys total)(B/O was 15)

http://backpack.tf/profiles/76561198123097664#!/compare/1456646400/1456732800

http://www.tf2outpost.com/trade/27891507

Sold for a Stormy Storm Helmet Without A Home(14 Keys) and 1 Key(15 Keys total)

http://backpack.tf/profiles/76561198031569942#!/compare/1457856000/1458198000

Three sales, 15 Keys should be fine.

Additional Proof/Counter-Proof/Constructive Criticism/Feedback is always appreciated.