None of these are priced yet.

Sale 1:

Sold for Aces High Helmet Without a Home (Mini at 11+ below) + 4 keys + ~0.5 keys in items

http://www.tf2outpost.com/trade/28770414 - No clear B/O here

http://www.tf2outpost.com/trade/28803336 - Using this as the B/O (16)

Seller: http://backpack.tf/profiles/76561197964929999#!/compare/1487376000/1487635200

Buyer: http://backpack.tf/profiles/76561198321556119#!/compare/1487548800/1487635200

X = 16

Sale 2:

Sold for 14 keys

http://www.tf2outpost.com/trade/28762736 - B/O of 14

Seller: http://backpack.tf/profiles/76561198021055079#!/compare/1486252800/1486339200

Buyer: http://backpack.tf/profiles/76561197964929999#!/compare/1486339200/1486425600

http://imgur.com/a/SMj05

X = 14

Sale 3:

Sold for 13 keys

No outpost

Seller: http://backpack.tf/profiles/76561198183681006#!/compare/1484352000/1484438400

Buyer: http://backpack.tf/profiles/76561198272416469#!/compare/1484092800/1486598400

X = 13

Sale 4:

Sold for 13 keys

http://www.tf2outpost.com/trade/28741533 - B/O of 13, declined 11

Seller: http://backpack.tf/profiles/76561198138328639#!/compare/1485734400/1485907200

Buyer: http://backpack.tf/profiles/76561198067055768#!/compare/1485907200/1485993600

X = 13

Sale 5:

Sold for Logo Plug-in Prospector (11.5)

http://www.tf2outpost.com/trade/28780674 - No B/O

Seller: http://backpack.tf/profiles/76561198172015765#!/compare/1487808000/1487894400

Buyer: http://backpack.tf/profiles/76561198262604439#!/compare/1487808000/1487894400

X = 12

Sale 6:

Sold for ~12 keys in items

No outpost

Seller: http://backpack.tf/profiles/76561198262604439#!/compare/1488153600/1488240000

Buyer: http://backpack.tf/profiles/76561198364206620#!/compare/1488153600/1488240000

X = 12

Sale 7:

Quicksold for 10 keys

No outpost

Seller: http://backpack.tf/profiles/76561198267189538#!/compare/1484870400/1484956800

Buyer: http://backpack.tf/profiles/76561198185580303#!/compare/1484956800/1485043200

X = 10

Sale 8:

Sold for Aces High Detective Noir

No outpost

Seller: http://backpack.tf/profiles/76561198135508009#!/compare/1483142400/1483315200

Buyer: http://backpack.tf/profiles/76561198072511800#!/compare/1483228800/1485561600

Probably better to update the Noir with this sale.

Sale 9:

Sold with Spec. KS Bazaar Bargain for Logo Sober Stuntman

Seller: http://backpack.tf/profiles/76561198202592232#!/compare/1483574400/1483747200

Buyer: http://backpack.tf/profiles/76561198021055079#!/compare/1483660800/1483747200

Might be better to update the Stuntman with this sale.

Sale 10:

Sold for Electric Hat Protector Head Full of Hot Air + Spec. KS Gold Botkiller Flamethrower MK.II (2)

No outpost

Seller: http://backpack.tf/profiles/76561198356618054#!/compare/1487376000/1487462400

Buyer: http://backpack.tf/profiles/76561198058200195#!/compare/1487376000/1487462400

May end up being an outlier without a B/O cap.

Helmet Without a Home Mini:

Sold for Kill-a-Watt Tungsten Toque + 2 keys

No outpost

Seller: http://backpack.tf/profiles/76561198004517334#!/compare/1487116800/1487203200

Buyer: http://backpack.tf/profiles/76561198321556119#!/compare/1486944000/1487203200

With buyers for any unusual for 8 keys, the lowest the toque can be is 9 keys, which would bring the sale to be at least 11 keys.

Sellers:

13 keys:

http://i.imgur.com/39DRWsC.png - 2 days

http://backpack.tf/u/76561198002186909

http://i.imgur.com/yO8qiAz.png - 8 days

http://backpack.tf/u/76561198061376237

http://www.tf2outpost.com/trade/28793413

14 keys:

http://i.imgur.com/I6LusWZ.png - 20 days

http://backpack.tf/u/76561198076020691

http://www.tf2outpost.com/trade/28757166

http://i.imgur.com/HBmNzQ5.png

http://backpack.tf/u/76561198152648165

http://www.tf2outpost.com/trade/28646269 - 2 months, listed for 20 here, probably lowered recently

16 keys:

http://i.imgur.com/yVVruJI.png

http://backpack.tf/u/76561197964929999

http://www.tf2outpost.com/trade/28803336 - young-ish

25 keys:

http://www.tf2outpost.com/trade/28566708 - 4 months (see comments for B/O)

http://backpack.tf/u/76561198065767713

45 keys:

http://i.imgur.com/mAdSUUu.png - Strange

http://backpack.tf/u/76561198018101085

http://www.tf2outpost.com/trade/28776607

Offers:

http://www.tf2outpost.com/trade/28714152 - 1 month, on SCM

http://backpack.tf/profiles/76561198083134207

Sales at:

10

12 (2x)

13 (2x)

14

16

10 quicksold. Excluding 10.

16 would be an outlier, based on current sellers and sales. Some of the sales lower than it are full pure sales too, so this should be fine to exclude.

Going with 12-14.