i agree with what victoria said. i feel like its said somewhere that they just... cant both "exist" at the same time. that being, existing relevant to canon. so once one is lost, the other can be found. or when one is found, the other slips away. thats one of the reasons jegbert keeping the ring safe was so important-- they both needed to make sure they held on to it so nobody else could get it, but doubly so that the other ring wouldn't appear.