Hi, it seems your simple, innocent scientific inquiry has turned into a flame war. I think it's great you have taken so much time to research this subject, including doing your own dissections and inspections. Most people never think past their own nose.
Personally I find myself of the opinion that the flushes are genuine, from my own experience, and from research here at curezone and a little bit on other sites. I have removed many so-called stones myself. Still, I see your point, where could they be stored? While I can't answer it, I myself trust the photos whose links I have copied down below. Granted, they could be faked...but who would gain by this? Yeah, I supposed creating a base of people for future advertising here at curezone, but presently, I see no reason for fraud.
Good luck, and please feel welcome here. We all gain by each person's contributions.