The values mentioned for these Bicentennial Quarters seem extraordinarily high and are likely inaccurate.
While it's not uncommon for rare coins to fetch significant sums at auction or in private sales, values in the tens of millions of dollars for individual quarters are highly unlikely and would be unprecedented in the numismatic world.
Bicentennial Quarters, minted in 1976 to commemorate the United States' 200th anniversary, are not typically considered among the rarest or most valuable coins.
While certain Bicentennial Quarters can indeed have added value in certain conditions, the values mentioned here are far beyond what is typically seen in the coin collecting community.
It's important to exercise caution and skepticism when encountering claims of extremely high values for coins, especially without proper context or verification from reputable sources.
If you're interested in rare coins, it's always a good idea to research and consult with numismatic experts to get accurate information about their value and rarity.