Still 26 Keys

70 day old sales are fine, it's just that < 2 month sales are preferred right?

Sale #1:

Sold for 26 Keys Pure - http://www.tf2outpost.com/trade/25480696 (Offered 25, wanted 27, settled in the middle)

BP of Seller Before Sale:

http://backpack.tf/profiles/76561197987128070?time=1428994800 (Apr. 14)

BP of Seller After Sale:

http://backpack.tf/profiles/76561197987128070?time=1429081200 (Apr. 15)

SBTWC Boron Beanie - http://backpack.tf/item/2078567151

Comparison Script: http://i.imgur.com/kn6vJ8o.png

= 26 Keys

Conclusion:

By sorting the inventory by time and checking the histories of the keys, it can be confirmed that it did indeed sell for 26 Keys. One recent sale at 26, taking the range of 26 Keys flat.