Hi, i just bought DD2

And i have found lots and lots of locked chests. I supposed i don't need a key to every each and one of'em, i can't find any lockpicks, do i just need the skill to open them up? (i haven't got skill at lockpinging)
And where do i find the key to the millers basement? i spoke to the two guys in the black boar, but i can't remember what they said. They said that i hide his key in a kettle?

tnx