2 years outdated. Only sale.

Sale #1

http://www.tf2outpost.com/trade/21604248

Sold for duped Knifestorm Chieftain's Challenge(4.55 buds * 0.9 = ~4.1 buds) + 19 keys

Backpack of seller

http://backpack.tf/profiles/76561198057273065?time=1355720229 Before

http://backpack.tf/profiles/76561198057273065 After

Backpack of buyer

http://backpack.tf/profiles/76561198044062952?time=1406703600 before

http://backpack.tf/profiles/76561198044062952?time=1406811972 After

Total: ~5.1 buds.(Rounding off to 5 buds.)

Credits to Satanic Molten Fetus Slayur for the screenshot

http://uploadir.com/u/xr7r3ix0

The knifestorm chieftain's challenge is priced based on duped ones. So backpack.tf price can be used.