Ring (V2)

[vagabond]

You've concealed me
in a precious music box
unfastened only
if I disengage the locks.               it´s logical that a thing only unfastens once the locks are disengaged. those two lines are don´t add to the content

In there, you'll find a broken facet             facet puzzles me a bit, not sure if a facet can break by itself (as it is always a part of a whole thing)
                                                                               and how can it be echoING if it is already broken?  but maybe i just miss a meaning of that word.
echoing a note,
plucking at discordant needles,
seeming overwrote.

V1

You've concealed 
my heart inside a music box
you'll only open 
once I've chimed a final vox.

In there, you'll find it's changed  
and left behind a note:
"I'll never sing for you again, 
or play a single note."

can´t really follow the metaphor with the music box, but the last line brings out the poem´s meaning i think