This looks more reasonable.

Sold for 11 Keys

http://backpack.tf/profiles/76561198082381645/#!/compare/1457856000/1458025200

Sold with ~1 Key in Sweets for an Orbiting Planets Tam O' Shanter(11.5 Keys, rounding to 12)(11 Keys total)

http://backpack.tf/profiles/76561198273229256/#!/compare/1457856000/1458025200

Sold for a Strange Pro KS Ambassador(~7 Keys) and ~9 Keys in Sweets(~16 Keys total, Outlier)

http://backpack.tf/profiles/76561198058546745/#!/compare/1454227200/1454313600

16 seems really high compared to other sales, 11 Keys should be fine.

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