Solds for 26 keys:

http://s17.postimg.org/toi93v9wf/26keys1max.png

http://s17.postimg.org/er9s2uwnz/26keys2max.png

I sold 6 for 27 keys each painted :

http://postimg.org/image/45d4tk259/

http://postimg.org/image/k0jlk8glb/

http://postimg.org/image/pc2bej8b9/

http://postimg.org/image/gpx60rbbh/

http://postimg.org/image/qs25j0a79/

http://postimg.org/image/yisgubsnx/ - That day was the earbud 6 keys

http://www.tf2outpost.com/trade/25710030

http://www.tf2outpost.com/trade/25705569

http://www.tf2outpost.com/trade/25632744 - 3 sold

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Sales for 27 keys :

http://www.tf2outpost.com/trade/25626006

http://www.tf2outpost.com/trade/25574692

http://www.tf2outpost.com/trade/25705934

http://www.tf2outpost.com/trade/25467612

http://www.tf2outpost.com/trade/25715388

http://www.tf2outpost.com/trade/25714259

http://www.tf2outpost.com/trade/25708268

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Unsolds for 28 keys :

http://www.tf2outpost.com/trade/25454690 - 2 weeks

http://www.tf2outpost.com/trade/25616901 - 1 week

http://www.tf2outpost.com/trade/25580888 - 1 week

http://www.tf2outpost.com/trade/25642641 - 1 week

http://www.tf2outpost.com/trade/25630290 - 1 week

http://www.tf2outpost.com/trade/25606970 - 1 week

http://www.tf2outpost.com/trade/25669950 - 5 days

http://www.tf2outpost.com/trade/25685748 - 3 days

http://www.tf2outpost.com/trade/25696702 - 2 days

Supporting proof: http://backpack.tf/stats/Unique/Max%27s%20Severed%20Head/Tradable/Craftable

About half of a page 27 keys (painted)

Credits: http://backpack.tf/u/76561198003404879