Regarding auctions of automatic musical instruments, in my main
business, rare coins (http://stacks.com/), we have found that
if we keep an unsold item listed on the Internet and mark it
"Post-Sale Buy," and give the minimum price, _many_ items are
indeed sold in the next few days.  I would think this would be
very effective for unsold music boxes and the like.

Dave Bowers
Wolfeboro Falls, New Hampshire