Sale 1 :

Before : http://backpack.tf/profiles/76561198043797498?time=1432105200

After : http://backpack.tf/profiles/76561198043797498?time=1432191600

Sold for a Frostbite Broadband Bonnet ( 26 keys ) but 2 keys were added : ( 26 * 0.9 ) - 2 = 21 keys

Sale 2 :

Before : http://backpack.tf/profiles/76561198081272794?time=1429513200

After : http://backpack.tf/profiles/76561198081272794?time=1429599600

Sold for Vivid Plasma Respectless Rubber Glove ( 26 keys ) but a strange festive eyelander was added ( 2 keys ) : ( 26 * 0.9 ) - 2 = 21 keys

Mini on the glove :

Before : http://backpack.tf/profiles/76561198126683015?time=1433574000

After : http://backpack.tf/profiles/76561198126683015?time=1434265200

Sold for a Stormy Storm Hottie's Hoodie ( 30 keys ) but 1 key was added : ( 30 * 0.9 ) - 1 = 26 keys

Sale 3 :

Before : http://backpack.tf/profiles/76561198163336238?time=1429081200

After : http://backpack.tf/profiles/76561198163336238?time=1429167600

Sold for a Stormy Storm Napper's Respite : 20 * 0.9 = 18 keys

Mini on the napper's :

Before : http://backpack.tf/profiles/76561198163336238?time=1430550000

After : http://backpack.tf/profiles/76561198163336238?time=1430722800

Sold for a Circling Peace Sign Napper's Respite : 22 * 0.9 = 20 keys

Rounding the range from 18 to 20 keys.

Supportive criticism welcome