Yeah.

Sold for a Duped Orbiting Fire Gentleman's Ushanka(18 Keys with Overpay)

http://backpack.tf/profiles/76561198058289334?time=1443337200 (September 27th)

http://backpack.tf/profiles/76561198058289334?time=1443423600 (September 28th)

Sold with ~2 Keys in Sweets for a Green Confetti Hard Counter(11 Keys with Overpay) and a Smoking Prancer's Pride(11 Keys with Overpay)(20 Keys total)

http://backpack.tf/profiles/76561198150729559?time=1446188400 (October 30th)

http://backpack.tf/profiles/76561198150729559?time=1446274800 (October 31st)

Sold for a Circling TF Logo Brigade Helm(22 Keys, Offered)

http://backpack.tf/profiles/76561197996714121?time=1445842800 (October 26th)

http://backpack.tf/profiles/76561197996714121?time=1445929200 (October 27th)

http://www.tf2outpost.com/trade/27310714

Duped Orbiting Fire Gentleman's Ushanka mini suggestion

Sold for an Australium Spec KS Minigun(20 Keys with Overpay)

http://backpack.tf/profiles/76561198058289334?time=1443855600&compare=1444374000

Using 20.

Sales seem to fit, 18-22 Keys should be fine.

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