Steel Keys...what are they for?

I was running around in the shiverpeaks and a Griffon dropped a Steel Key. Any idea where I can use it? Other monsters dropped Shiverpeak keys, which i could use on chests in the area, but i've been to several different places and cant find a use for the Steel Key...anyone know?

Steel Key can be used to open chests in northern shiverpeaks e.g.Frost Gate, Bolis Pass etc.

ah, ok. thx a bunch