I had this unusual a few days ago, and found that my offers overall were easily beating the current range for this. Additionally there are quite rare on the market, with normally only 2 or 3 for sale at any time at least from what I could find.

Link 1 - Was my own trade, I sold it for 7 in unusuals according to backpack.tf prices (Vivid Phantom + Beams Noir) and other offers including Eerie Cosa + Flies Modest (~8! but thought the offer I took would be easier to sell), Gen Robo Sandvich + White Bills (~6.4) and PE Ten Gallon + #2 Brain Bucket (~4 for the unusual with an extremely low craft number). The guy that offered the Sunbeams Toque also offered 5 pure but he hid his offer before I could get proof of that.

Link 2 - Sold for 5 buds according to the OP of that trade.

Link 3 - Rejected 4 buds + 19 keys and said the minimum that would be accepted is 5 buds. Also rejected an offer of a Peace Modest + Misty Skull Billycock (~3.3 on Modest and unknown on the Billycock)