Finally done with this.

Sold for a Gifted Green Energy Berliner's Bucket Helm(28 Keys with Overpay, Outlier)

http://backpack.tf/profiles/76561198157499812?time=1447401600 (November 13th)

http://backpack.tf/profiles/76561198157499812?time=1447660800 (November 16th)

Sold for a Steaming Thirst Blood(16 Keys with Overpay) and ~2 Keys in Sweets(18 Keys total)

http://backpack.tf/profiles/76561198232921544?time=1448006400 (November 20th)

http://backpack.tf/profiles/76561198232921544?time=1448092800 (November 21st)

Sold for a Purple Confetti Buckaroos Hat(12 Keys with Overpay)

http://backpack.tf/profiles/76561198157499812?time=1448265600 (November 23rd)

http://backpack.tf/profiles/76561198157499812?time=1448438400 (November 25th)

http://backpack.tf/profiles/76561198009424974?time=1448265600 (November 23rd)

http://backpack.tf/profiles/76561198009424974?time=1448438400 (November 25th)

Gifted Green Energy Berliner's Bucket Helm mini suggestion

Sold for 27 Keys and a Miami Nights Platinum Pickelhaube(10 Keys with Overpay)(37 Keys total)

http://backpack.tf/profiles/76561198066169323?time=1448697600 (November 28th)

http://backpack.tf/profiles/76561198066169323?time=1448956800 (December 1st)

Only gifted sale, can't be valued more than clean. Using clean price.

Considering there's two sellers at less(13 on OP, 16 on classifieds), i'm keeping 12 in the range. 18 Doesn't seem farfetched though, considering the really high 28 key outlier.

Two sales, 12-18 Keys should be fine.

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