The claim that a single rare Bicentennial Quarter is worth nearly $90 million, with three more worth over $50 million each, is incredibly extraordinary and highly improbable within the realm of coin collecting.
Bicentennial Quarters were minted in large numbers to commemorate the 200th anniversary of the United States and are generally not considered rare or valuable.
While there are certainly rare coins that can command high prices, valuations in the tens of millions of dollars for individual coins, especially common ones like Bicentennial Quarters, are virtually unheard of.
For a coin to be valued at such astronomical figures, it would likely need to possess extremely unique characteristics, such as a major minting error, historical significance, or some other exceptional attribute.
Without specific details about the rarity or uniqueness of these coins, it's difficult to assess their true value.
If you believe you have rare coins that may be valuable, it's essential to seek a professional appraisal from a reputable numismatist or coin dealer.