Okay, here's the numbers you're I'm gonna use, okay? :P

Credit to Fuzzlebutt for proof of sale one.

SALES:

http://gyazo.com/af8f710a5e1939dac9fc27eb51e2424a

http://gyazo.com/550c94e1f9f5dc7e12581ab3208a919b

and lastly the HKC itself and scatter: http://gyazo.com/304aceb9c95ab9097715696c54ffa61a

http://backpack.tf/vote/id/554b4317b88d88de038b45fc TW Wraith, 61 keys

http://backpack.tf/vote/id/554b3cc5ba8d88c5048b464c KaW KE, 72.5 keys

Clean Max, 26 keys no overpay

http://puu.sh/hEA2J/7ec8e0730a.png Spec Aussie Scatter, avg ~40 keys

http://puu.sh/hEA60/7dfe1444e2.png Pro Aussie Sniper, ~50 keys

((61 + 72.5 + 40 + 50) * 0.9) + 26 = 227.15 (rounding to 230)

And you CAN suggest using only this sale, IF it's the only recent sale. I will check now :3

EDIT: LOTS of other recent sales. Give me a minute

http://www.tf2outpost.com/trade/25727542 Sold for MG Hood (255)

255 * 0.9 = 226.5 (rounding to 230)

Histories;

http://backpack.tf/item/3361924926

http://www.tf2outpost.com/item/440,3736261767,1095,5

Let it ride.