A good, reliable place to have your musical boxes expertly restored
is by Michael E. (Everett, I think) at the Musical Wonder House in
Wiscasset, Maine.

He maintains the Konvalinka collection and has built some beautiful
hand-played instruments from scratch.  I don't what his backlog is
like, but I doubt your instruments will gather dust.  Phone numbers
are 207-882-7163 and 800-336-3725.

Mike Knudsen