Sale 1 :

Before : http://backpack.tf/profiles/76561198065324789?time=1439449200

After : http://backpack.tf/profiles/76561198065324789?time=1439535600

Sold for a Disco Beat Down Dragonborn Helmet ( 30 ) and 9 keys in items : 39 * 0.9 = 35 keys

Mini on the helmet :

Before : http://backpack.tf/profiles/76561198076693690?time=1432796400

After : http://backpack.tf/profiles/76561198076693690?time=1432969200

Sold for a Stormy Storm Cosa Nostra Cap : 30 keys

Sale 2 :

Before : http://backpack.tf/profiles/76561198016122504?time=1437375600

After : http://backpack.tf/profiles/76561198016122504?time=1437462000

Sold for a Green Confetti Western Wear ( 14 ) + a Strange Killstreak Australium Wrench ( 25 ) : 39 keys

Mini on the western :

Before : http://backpack.tf/profiles/76561198010147137?time=1436338800

After : http://backpack.tf/profiles/76561198010147137?time=1436425200

Sold for a Orbiting Fire Fruit Shoot : 16 * 0.9 = 14 keys

Sale 3 :

Before : http://backpack.tf/profiles/76561198055710666?time=1435215600

After : http://backpack.tf/profiles/76561198055710666?time=1435388400

Sold for a Frostbite Lucky Shot ( 46 ) but 2 keys in items were added : 46 - 2 = 44 keys

Mini on the shot :

Before : http://backpack.tf/profiles/76561198055710666?time=1437894000

After : http://backpack.tf/profiles/76561198055710666?time=1438326000

Sold for a Eerie Orbiting Fire Stainless Pot : 51 * 0.9 = 46 keys

Rounding the range to 35-45 keys.

Supportive criticism welcome