after i get the silver key, i can't seem to get back to the box no matter how much i explore the glades
Viewing post in Pokemon: Psychic Safari comments
Opening the boxes unlocks some otherwise-hidden content elsewhere! As the game expands, I want to keep including reasons to go back and explore places you might've already been to see what changes; the chests are an early example of that. In this case, the zones to check after opening them are the Hot Springs and the Grove.