They're either all good, or none of them are.

3 in Existence

1

was purchased before April from the unboxer

http://backpack.tf/profiles/76561198004393318?time=1396940400

2

was purchased on August 22 2014 from a scammer for what looks like 50 keys and black, non-tradeable Summer Shades

Scammer before http://backpack.tf/profiles/76561198137509378?time=1408690800

Purchaser before http://backpack.tf/profiles/76561198060410890?time=1408604400

Purchaser after http://backpack.tf/profiles/76561198060410890?time=1408777200

3

Purchased on Sept 8 for a Harvest Drill and 1 key from Vegan to Beams

http://www.tf2outpost.com/trade/21968213

Seller before http://backpack.tf/profiles/76561198007474191?time=1409986800

Seller after http://backpack.tf/profiles/76561198007474191?time=1410246000

Harvest drill is 8.1 * 0.9 = 7.3