This makes up for the 6 days I went suggestion-less.

http://backpack.tf/item/5375027181

Sale 1) Sold + 3 Keys for a Circling Hearts A Rather Festive Tree

http://backpack.tf/profiles/76561198069915123#!/compare/1488499200/1488585600

Fits in the range.

Sale 2) Sold for a Professional Killstreak Australium Scattergun (~34 Keys)

http://backpack.tf/profiles/76561198172913134#!/compare/1489104000/1489190400

http://backpack.tf/item/5017727531

Sale 3) Sold for a Nuts and Bolts Brotherhood of Arms (40 Keys) + <0.5 Keys of Items

http://backpack.tf/profiles/76561198126679929#!/compare/1485648000/1485820800

Rounding to 40 Keys

Brotherhood Mini

http://imgur.com/a/yOgEJ - 1 Month Unsold at 40 Keys

Sale 4) Sold for an Anti-Freeze Base Metal Billycock

http://backpack.tf/profiles/76561198195777415#!/compare/1485993600/1486080000

Fits in the range.

Sale 5) Sold + ~6 Keys of Items + 4 Keys for a Stormy 13th Hour German Gonzilla (44 Keys)

http://backpack.tf/profiles/76561198277396732#!/compare/1486512000/1486598400

44 - 10 = 34 Keys

http://backpack.tf/item/4954481678

Sale 6) Sold for a Circling Peace Sign Reggaelator (43.5 Keys)

http://backpack.tf/profiles/76561198182681385#!/compare/1483833600/1483920000

Rounding to 44 Keys