Figure out how to send an independent lab's equipment and personal there or a sample of the substance to an independent lab that verify and if true. Also ensure that they can also do material analysis such as X-Ray spectroscopy & diffraction , and a battery of other stuff if a miracle did occur.
For all we know, this could be one of those accidents of sloppiness that introduces a particular containment that makes everything line up as a super conductor that nobody else will easily reproduce.