Screenshots:

https://www.youtube.com/watch?v=dkXUJyyE5sQ

------

Sold for 1100 USD:

http://i.imgur.com/YLf7ntG.png

1100 / 1.825 = 602.7397 keys

~600 keys

------

Sold for these:

http://backpack.tf/profiles/76561198044540443?time=1436857200 (July 14th)

http://backpack.tf/profiles/76561198044540443?time=1437030000 (July 16th)

http://backpack.tf/profiles/76561198044540443?time=1436857200&compare=1437030000

Sale was apparently around 1600 keys. Seems like an outlier.

------

Sold for Green Energy Crone's Dome (~700):

http://www.tf2outpost.com/trade/26169226

http://backpack.tf/profiles/76561197971125672?time=1437030000 (July 16th)

http://backpack.tf/profiles/76561197971125672?time=1437116400 (July 17th)

http://backpack.tf/profiles/76561197971125672?time=1437030000&compare=1437116400

~700 keys

Green Energy Crone's Dome:

~700 keys

------

Sold with [Demonflame Antlers + Darkblaze Killer Exclusive] for [Arcana Killer Exclusive + Sunbeams Soldier's Stash + Sunbeams Exquisite Rack + Scorching Flames Lucky Shot + Strange Professional Killstreak Australium Grenade Launcher + Strange Specialized Killstreak Festive Grenade Launcher]:

http://www.tf2outpost.com/trade/26499589

http://backpack.tf/profiles/76561197995194055?time=1438412400 (August 1st)

http://backpack.tf/profiles/76561197995194055?time=1438585200 (August 3rd)

http://backpack.tf/profiles/76561197995194055?time=1438412400&compare=1438585200

Just a bad deal.