Hard drops.

Sold for a Bubbling Bloke's Bucket Hat(10 Keys with Overpay) and ~12 Keys in Sweets(11 Keys with Overpay)(21 Keys total)(B/O was 20)

http://backpack.tf/profiles/76561198028102463?time=1448179200 (November 22nd)

http://backpack.tf/profiles/76561198028102463?time=1448265600 (November 23rd)

http://www.tf2outpost.com/trade/27456328

Sold for a Kill-a-Watt Bolted Birdcage(12 Keys with Overpay) and a Terror-Watt Bloke's Bucket Hat(10 Keys with Overpay)(22 Keys total)

http://backpack.tf/profiles/76561198188959938?time=1448179200 (November 22nd)

http://backpack.tf/profiles/76561198188959938?time=1448265600 (November 23rd)

http://www.tf2outpost.com/trade/27478271

Added 2 Keys for a Haunted Ghosts Magnificent Mongolian(11 Keys with Overpay) and an Australium Spec KS Blutsauger(10 Keys with Overpay)(19 Keys total)

http://backpack.tf/profiles/76561198075045316?time=1449388800 (December 6th)

http://backpack.tf/profiles/76561198075045316?time=1449561600 (December 8th)

http://backpack.tf/profiles/76561198118496274?time=1449475200 (December 7th)

http://backpack.tf/profiles/76561198118496274?time=1450080000 (December 14th)

http://www.tf2outpost.com/item/440,4384342187,36,11 Blutsauger History

http://www.tf2outpost.com/trade/27519421

Two sales, 19-22 Keys should be fine.

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