Hi this is the section of my Chrono Trigger page
which has The location of the sealed boxs in the game. You
can only open these boxes with Marles pendent, and after the pendent is charged.
600 ad, 1 box, truce inn
600 ad, 1 box, guardia forest
600 ad, 1 box, guardia castle
1000 ad , i box, truce inn
1000 ad, 1 box, guardia forest