New suggestion, got proof of the original sale.

Anti-Freeze Hound Dog, no price set, 1 of 3 in game, none on the market. The other 2 are in the unboxer's backpacks, they're not selling. I'm not willing to sell mine either, but I thought this hat deserves to be priced.

SALE 1:

http://puu.sh/7bU4j.png - Unboxer sold it pretty cheap, sold it to X-Wing for 2 Buds, but these offers show that it could've fetched more.

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TRADE/SALE 2:

http://www.tf2outpost.com/trade/17515598 - Had a B/o of 4 Buds, I paid 40 Keys (2 Buds Pure) + A Blizz Bicorne (1.25 Buds) + a Steaming Backbiter's Billycock (14 Keys), About 4 Buds in mixed http://puu.sh/78h3G.png

OFFERS:

- Terror Watt Tough Stuff Muffs for the Hound Dog + His Phosphorus Hermes (The Muffs are priced at 12.5, and the Hermes is priced at 5.45 Buds, so that would price the Hound Dog at around 7.05 Buds, outlier)

- Cloudy Moon Little Buddy (4.7 Buds with overpay)

- Purple Energy Brain Slug + 5 Keys (About 4 Buds with overpay)

- "interest in C9 Bubble pipe?" - (The Pipe is priced at 7.35 buds, but it is unclear whether the person offering wanted the owner to add or not)