Sale #1:

Sold for $30.43-$34.99 (~12-14 keys)

http://i.imgur.com/wjId3cV.png

https://backpack.tf/item/429961931

Sale #2:

Sold for 13 keys

http://i.imgur.com/X9R9nyi.png

https://backpack.tf/item/831308252

Sale #3:

Sold for 10 keys

http://www.tf2outpost.com/trade/28106802

https://backpack.tf/profiles/76561198063616875#!/compare/1461715200/1461801600

Low.

Sale #4:

Seems to be 1:1 with DP Ze Goggles

https://backpack.tf/profiles/76561198104123262#!/compare/1461196800/1461283200

https://backpack.tf/profiles/76561198023542389#!/compare/1461196800/1461283200

DP Ze Goggles is a little outdated, but has a low-end of 14 keys, this should support the high-end.

Sale #5:

http://www.tf2outpost.com/trade/28049256 Quick-sold for 9 keys

http://i.imgur.com/d76e2ed.png A few buyers around 9-10 keys

http://i.imgur.com/wE5Nrlp.png SCM buyers around $29

I sold my other one for pretty much the same thing as sale #1 too:

http://backpack.tf/item/1841569116

http://i.imgur.com/NoFg6pm.png