Today Laukhuff is best known as a supplier of parts to the pipe organ
industry, but they've been around a long time. It might be worth a
query to them with what you know, though it is a bit odd if everything
is labeled in French, but not conclusive. They have a Facebook page
and most likely a website. Facebook is all in German, but there's likely
a person or persons there who has basic fluency in English.

It wasn't unusual for pipe organ builders to have their own player
design, and organ rolls are usually unique to organs, often to specific
builder; you don't just stick a player piano roll in it. Since the
compass of an organ manual is usually 61 notes or 56 notes on older
(or even occasional new ones) pipe organs, a 71-note player would cover
all but the top two notes if an octave coupler were pulled. That would
mean at least some of the ranks would be 73 pipes (maybe only 71) or
you'd lose the top octave if you were using the octave coupler.

That's probably not significant for an organ since many pipe organs with
octave couplers do not have that extra octave at the top. Someone with
access to the player might poke around in dark attics, basements, or
closets; there could be an old box or two of rolls stuffed back in there.
That's about all the light I can throw on the subject.

Dennis Steckley