As Teresa pointed the policy quoted refered to Federal lands and further, "significant" caves on those lands which have a unique definition. Rptyd is from KY and I believe (but may be wrong) that the selling of ANY speleothem is illegal in KY, thus if a seller stated their location as KY then "applicable state laws" would apply.
I also know of several transplanted and outright fake formations in show caves that are perfect. Even an experianced caver would not notice without the very minor tell-tales being pointed out. Maybe it's time to start my replica cave formation business on Ebay sign them like they do modern flint spearpoints.