Carl,  I once owned a Reproduco similar to the one you described.
I believe that all Reproducos of this type had the 12 bass pipes on
the back of the piano.  These would have to be removed to move the
instrument, so look around the lady's home and garage for these pipes
and the wind chest that they mount upon.  There will also be a large
reservoir for the wind supply and it may been mounted either on the
piano or the blower box.  The blower box should also contain the
vacuum pump.

Regarding whether the "Gedeckt" stop actually plays Quintadena pipes,
the instrument is most likely a mortuary version of the Reproduco and
is like the one I had which contained Gedeckt pipes, not Quintadenas.
You will notice that the mouths of the pipes have a curved upper lip
and a fairly soft, dull sound.  Consequently, the instrument will not
sound like the Reproducos that you may have heard personally or from
recordings.

One may be able to locate some single tune OS rolls which are usually
mortuary music.  I had only five original rolls.   Some are very
pleasant to listen to, but I just enjoyed playing regular piano rolls
on the Reproduco I had.  I did buy one or two NOS rolls and re-spooled
them with two tunes per roll, but the 88-note rolls were much more
enjoyable in my particular case.

The piano and pipes pretty much balanced out in volume and it was quite
enjoyable to play.  What was lacking was the characteristic Reproduco
sound created by the Quints and the Stopped Flutes together.  I wish
I still had my Reproduco, but the pipe organ bug bit and I moved up to
to a seven rank pipe organ.  Now its gone and I'm back to just pianos.

I don't have any clue as to the current value of Reproducos.  Perhaps
someone will give you a response in that regard.

Wade Newton
Texas