It's highly improbable that rare Bicentennial quarters or dimes worth $4 million each are still in circulation.
If such coins exist and are indeed worth millions, they would likely have been discovered and removed from circulation long ago by collectors, coin enthusiasts, or individuals aware of their potential value.
While it's true that valuable coins can sometimes remain in circulation for a while before being discovered, coins of such extreme value would likely be swiftly identified and withdrawn from circulation by knowledgeable collectors or professionals.
If you have a particular coin you suspect may be valuable, it's best to consult with numismatic experts or professional coin appraisers who can provide accurate information about its worth and rarity.
they would likely have been discovered and removed from circulation long ago by collectors, coin enthusiasts, or individuals aware of their potential value.
coins of such extreme value would likely be swiftly identified and withdrawn from circulation by knowledgeable collectors or professionals.