Can we open treasure chest without key ?

[Choup]

Hello,

While browsing in the AH, i noticed 3 items :
Thief's tools, Skeleton key and Living key.

Are we, thiefs, able to open treasure chests without the specific key (for example without the Palborough mine key) ?
If so what level is needed and how do we do that ? Does that work for all treasure chests ?
Those items can just be bought in AH or can we find them somewhere else or craft for them ?

Sorry for all the questions but i really wonder how it work.
Choup