Yes, the band organ table favor is really an incredible accomplishment.
The little sheet accompanying it says there are more than 150 parts,
cuts, imprints, and other work on each one, and this would just not
have been possible if this was a commercial product.  A tour du force
and a labor of love.  If there are still any available, grab 'em!

One caution about those batteries -- I, too, got one home with
nearly dead batteries.  We were encouraged to try it out right there,
and I replaced the tape and cardboard covering the on button off-center,
so the button was pressed for days.  When I opened the case to change
the two size AAA batteries, I noticed the dead ones were a bit slick
and might be leaking from my mistreatment.

I suggest that in a month or so, when you are finished playing the
little wonder for friends and are going to leave it on the shelf for
awhile, *remove the batteries!*

Future musings --

Looking at the compact electronics of the AMICA Convention 2008 table
favor got me thinking.  On the way to the convention I visited a science
museum shop and they had tiny flashlights operated by a dynamo-crank.
Big ones have been around for years, but this new one is a keychain
charm and only about an inch square and a quarter inch thick, including
two LED bulbs and the crank.

Some talented electronic genius could probably put these two things
together and make a proper working model of a monkey organ, that
requires a deft finger to crank at the right speed!

Jim Katz