http://www.tf2outpost.com/trade/15608525 - Sold for a Cauldron Company Man (5)

http://www.tf2outpost.com/trade/15604874 - Sold with a Flies Cosa for a C9 Titanium Tyro (2.5) Yet it had an offer of a Harvest Coupe (4.6)

http://www.tf2outpost.com/trade/15588072 - Sold with a Flies Cosa for a Burning Fuka (3.9)

http://www.tf2outpost.com/trade/15587510 - Sold with the Surge Hat of Cards for a PE Spartan and a PE Fuka (8.7 - 3.3 = 5.4)

http://www.tf2outpost.com/trade/15585896 - Posts are hidden but it appears to have sold with a Surge Hat of Cards for a Ghosts Company Man (3.9)

Pretty clear the 2.5 sale is an outlier.