If a major bank accumulated millions of ounces of physical silver, would the public ever know?

I keep seeing recurring claims about large-scale silver accumulation tied to major banks. The numbers change, but the pattern doesn’t. What strikes me isn’t whether the claims are true, but how hard they are to verify. COMEX inventory data shows movement, but not ownership. Regulatory reports show aggregate bank exposure, but not individual positions. Physical metal can move without any named disclosure. At what point does that lack of visibility become a transparency problem rather than just “how markets work”? Genuinely interested in how people here see it, especially those familiar with futures markets or warehouse reporting.