Turns out there was a clean one after all. Welp.

Added 1 Key for an Aces High Harmburg(21.5 Keys with Overpay) and a Dead Presidents Big Country(12.5 Keys with Overpay)(33 Keys total)

http://backpack.tf/profiles/76561198043347809?time=1447747200 (November 17th)

http://backpack.tf/profiles/76561198043347809?time=1447833600 (November 18th)

Sold for a Max's Severed Head w/ Rotten Orange Footprints(40 Keys)

http://backpack.tf/profiles/76561197987579006?time=1447488000 (November 14th)

http://backpack.tf/profiles/76561197987579006?time=1447660800 (November 16th)

http://www.tf2outpost.com/trade/27438372

---DUPED SALES---

Sold for a Scorching Flames Carouser's Capotain(~32.5 Keys with Overpay) and ~3.5 Keys in Sweets(36 Keys total)

http://backpack.tf/profiles/76561198086948995?time=1443855600 (October 3rd)

http://backpack.tf/profiles/76561198086948995?time=1443942000 (October 4th)

Sold for a Duped Circling Peace Sign Bonk Boy(45 Keys)(B/O was 40)

http://backpack.tf/profiles/76561197960533774?time=1448870400 (November 30th)

http://backpack.tf/profiles/76561197960533774?time=1448956800 (December 1st)

http://www.tf2outpost.com/trade/27511572

Duped Circling Peace Sign Bonk Boy mini suggestion

Quicksold for 35 Keys and a Batsaber(10 Keys)(45 Keys total)(Item IDs match)

http://backpack.tf/profiles/76561198106897791?time=1447142400 (November 10th)

http://backpack.tf/profiles/76561198106897791?time=1447228800 (November 11th)

http://www.tf2outpost.com/trade/27404913

I wouldn't use this normally, but there's a B/O cap anyways, so this should be fine. Using 45.

Max's Head w/ Footprints mini suggestion

Sold with ~12 Keys in Sweets(11 Keys with Overpay) for a Terror-Watt El Jefe(27 Keys with Overpay) and a Haunted Ghosts Furious Fukaamigasa(24 Keys with Overpay)(40 Keys total)

http://backpack.tf/profiles/76561198027033926?time=1446883200 (November 7th)

http://backpack.tf/profiles/76561198027033926?time=1446969600 (November 8th)

http://backpack.tf/profiles/76561198038675069?time=1446883200 (November 7th)

http://backpack.tf/profiles/76561198038675069?time=1446969600 (November 8th)

Using 40.

Duped and Clean sales seem to support each other. Even without the duped sales though, the range would be the same. 33-40 Keys should be fine.

Additional Proof/Counter-Proof/Constructive Criticism/Feedback is always appreciated.