Only sales that I know of...

http://www.tf2outpost.com/trade/27946586

Sold in a day for 300 keys pure.

QUICKSOLD

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http://www.tf2outpost.com/trade/27914415

http://backpack.tf/profiles/76561198104074874/#!/compare/1458284400/1458457200

Sold for 400 keys pure

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http://backpack.tf/profiles/76561198049054413/#!/compare/1456214400/1456300800

I don't even know. Looks like a bulk deal to me.

Not using

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http://www.tf2outpost.com/trade/27847525 B/O of 400 keys

http://backpack.tf/profiles/76561198086682600/#!/compare/1455868800/1455955200

Sold for a DaD KE

480 keys, capping at 400 key B/O

400 keys

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http://www.tf2outpost.com/trade/27765060 No B/O

http://backpack.tf/profiles/76561198060976608/#!/compare/1455264000/1455350400

Looks like a mixed deal containing Terror-watt Ninjahood, prof ks aussie RL, nebula head full of hot air, mystery neptune's, venenata reggaelator + 200 keys FOR screaming tiger conga + screaming tiger High-five

Without doing minies since I'm using this as a supportive sale:

679.5 = Conga + 212.5

Conga = 467 keys SUPPORTIVE

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http://backpack.tf/profiles/76561198066921496/#!/compare/1453449600/1453536000

Sold in bulk to LadyGyal, relisted here: http://www.tf2outpost.com/trade/27765060

Can't use bulk sales like this.

NOT USING

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http://www.tf2outpost.com/trade/27887174 B/O of 550

Sold for Ghosts BoA + Burning Fortunate Son + Pro ks aussie Scattergun

300 + 200 + 47 = 547

Rounding up to 550 keys

OUTLIER

Fortunate Son mini:

http://www.tf2outpost.com/trade/27447757 sold for 200 keys

http://www.tf2outpost.com/trade/27857620 B/O of 220 for a month

Scattergun mini:

https://gyazo.com/3f59094dfc5bc31f27c9b845b92327bd

Buyer's at 45, lowest sellers at 47

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Sellers:

http://www.tf2outpost.com/trade/27843051 no B/O, offered well above 300 keys

http://www.tf2outpost.com/trade/27979543 no B/O

http://www.tf2outpost.com/trade/27978737 510 B/O

http://www.tf2outpost.com/trade/27955564 B/O of 500 keys

Refer to comments in the previous suggestion for other sales, and Foamy's bottom comment:

http://backpack.tf/vote/id/56f12b1eb98d88362f75a050

So putting it at 400-450.

Lemme know if you've found other recent sales :)