Sale 1 :

Before : http://backpack.tf/profiles/76561198027600982?time=1437289200

After : http://backpack.tf/profiles/76561198027600982?time=1437375600

Sold for a Knifestorm Tam O' Shanter ( 46 ) but a Massed Flies Surgeon's Shako was added : ( 46 * 0.9 ) - 18 = 23 keys

Mini on the shanter :

Before : http://backpack.tf/profiles/76561198060285753?time=1433314800

After : http://backpack.tf/profiles/76561198060285753?time=1433574000

Sold for a Burning Flames Rimmed Raincatcher : 46 keys

Mini on the shako : 3 hats in the world no recent valid sale so taking its normal price of 18 keys.

Sale 2 :

Before : http://backpack.tf/profiles/76561198032986467?time=1435906800

After : http://backpack.tf/profiles/76561198032986467?time=1436079600

Sold for a Blizzardy Storm Desert Marauder ( 25 ) : 25 * 0.9 = 23 keys

Mini on the marauder :

Before : http://backpack.tf/profiles/76561198008113369?time=1436079600

After : http://backpack.tf/profiles/76561198008113369?time=1436166000

Sold for a spec ks aussie black box : 25 keys

Thus taking the flat price of 23 keys.

Supportive criticism welcome