My first Unusual suggestion with actual math/actual evidence

(Fixed the Range + applied the * .9 overpay thingy)

SOLDS:

http://www.tf2outpost.com/trade/21993618 - Sold for a DP Chieftain's Challenge [1.7]

http://backpack.tf/profiles/76561198035237398?time=1407913200

http://backpack.tf/profiles/76561198035237398?time=1408086000

Proof that it was sold for a DP Chieftain's (History doesn't show the owner) http://www.tf2outpost.com/trade/22001028

Sold for a G. Energy Magistrate's Mullet (1.9)

http://backpack.tf/profiles/76561198111193915?time=1408690800

http://backpack.tf/profiles/76561198111193915?time=1408777200

http://imgur.com/2WKcfmF - Sold for a Circling Heart Engineer's Cap (Check my History etc.) 1.8 Buds

Sellers:

http://www.tf2outpost.com/trade/22328933 - 35 Keys (2 Buds)

Sellers @ Classifieds:

(Same Guy as sellers)

http://i.imgur.com/UNlYHJR.png - 37 Keys (2.1 Buds)

Note: If I need more evidence i'll be glad and search for more