3 sellers on outpost:

[url]http://www.tf2outpost.com/trade/5500262[/url] - 27 key B/O (stated in comments)

offers:

1 bud pure - 2 months ago

23 keys - 1 month ago

steaming elfin deal (~23 keys) - 2 months ago

[url]http://www.tf2outpost.com/trade/6985665[/url] - 26/27 key B/O (stated in comments)

trade 3 weeks old, 2 offers below 17 keys

[url]http://www.tf2outpost.com/trade/7655051[/url] - no B/O set

trade 2 days old, a few offers below 18 keys

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not a whole lot to go on, but it shows the high end should be lowered.