The first Suggestion with 3 solds of similar value o.o

Sale 1

http://www.tf2outpost.com/trade/22943868 Sold for DP Buckaroos

X = 1.1*0.9

X = 1

Buckaroos http://backpack.tf/item/1847513000

Escorter http://backpack.tf/item/2175853202

Mini for Buckaroos

2 on Classifieds for 1.1, using that as common selling point

Sale 2

http://www.tf2outpost.com/trade/23036086 Sold for DP Hard Counter

Hard Counter was valued at 18 keys (1.1 buds at the time)

X = 1.1*0.9

X = 1

Counter http://backpack.tf/item/3039141141

Escorter http://backpack.tf/item/2175853202

Mini for Counter

Multiple unsold at 1.1, and d0's 1m old trade at 1, using 1.05

http://www.tf2outpost.com/trade/23222561 Sold for Steaming Conquistador + 0.5 keys in sweets

X = 1.1

Before sale http://backpack.tf/profiles/76561198121277543?time=1413665339

After sale http://backpack.tf/profiles/76561198121277543?time=1413702000

Conquistador http://backpack.tf/item/772477905

Hard Counter http://backpack.tf/item/3039141141

Sale 3

http://www.tf2outpost.com/trade/23165307 Sold for 15 keys Pure

X = 15 keys

X = 1.01 buds (at the time) = 1

Escorter http://backpack.tf/item/2175853202

After Sale http://backpack.tf/profiles/76561198065114008?time=1414328946