Wonderfully explained Fingolfin, also maybe a key in hiding the Three Elven rings is their secrecy. While on their bearers hands the rings were invisible (except to the One ringbearer), then when the one is destroyed, you can spot the 3 rings on their fingers, showing their loss of power.
Besides the invisibility, Aragorn warns Frodo not to speak about the Elven rings. So the Elves were able to keep them a secret, of course they had to.
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